Rare Earth and Trace Element Patterns in Bedded- cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China :Implication for Depositional Environments

YUBing song; CHENJian qiang; LIXing wu; LINChang song

Article Contents

Article Navigation > Acta Sedimentologica Sinica > 2004 > 22(1): 59-66

YUBing song, CHENJian qiang, LIXing wu, LINChang song. Rare Earth and Trace Element Patterns in Bedded- cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China :Implication for Depositional Environments[J]. Acta Sedimentologica Sinica, 2004, 22(1): 59-66.

Citation:

Rare Earth and Trace Element Patterns in Bedded- cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China :Implication for Depositional Environments

1.
China University of Geosciences,Beijing 100083;
2.
Key Laboratory of Lithosphere Tectonics and Exploration, Ministry of Education, Beijing 100083

Received Date: 2002-09-05
Rev Recd Date: 2002-11-29
Publish Date: 2004-03-10

Abstract

Black rock series at the bottom of the Lower Cambrian in the Northern Tarim Basin, China, is com 2posed of black shales interbedded with thin - bedded cherts. Six chert samples were systematically collected from avertical section of 8. 8 meters in depth in Xiaoerbulak, Northern Tarim Basin. The cherts were crushed and ana 2lyzed for trace element and rare earth concentrations. Trace elements such as V, Cu, Zn, U, Pb, Ba, Cd, Ag,Mo, As and Sb are highly enriched, and others such as Rb, Zr, Cs, Hf, Ta, W, Tl, Bi and Th are highly deplet 2ed in the cherts. These trace element patterns suggest that the cherts may be of deep crustal origin. The low ratiosof Th/ U and Rb/ Sr further suggest that the cherts are of earth interior sourcesor received hydrothermal input dur 2ing their deposition. The chondrite - normalized Ce/ Ce3ratio rangesfrom 0. 42 to 0. 83, with an average of 0. 60.North American Shale Composite (NASC) - normalized Ce/ Ce3ratio ranges from 0. 42 to 0. 79, with an averageof 0. 57. Negative Ce anomalies are distinct. ∑ REEs in the cherts generally increase from 10. 50 ppm at the bot 2tom to 35. 97 ppm at the top of the sampled section. NASC - normalized (La/ Lu) _N ratio decreases from 2. 72 atthe bottom to 0. 67 at the top. NASC - normalized (La/ Ce) _N ratio increases from 1. 36 at the bottom to 3. 13 atthe top. These REE patterns are very similar to those for the cherts deposited in the pelagic ocean - basin floor inthe Franciscan Complex exposed at Marin Headlands, California (F - MH chert) (Murray et al.,1991). Chon 2drite - normalized Eu/ Eu3value markedly decreases upward in the section from 5. 54 at the lowermost to 0. 73 atthe top, and NASC - normalized Eu/ Eu3value decreasesfrom 8. 05 to 1. 03. The relatively high Eu/ Eu3ratio forthe chertsfrom the North Tarim Basin is most likely due to a hydrothermal input (e. g., Eu/ Eu3 ～10). The sys 2tematic decrease of Eu/ Eu3ratio from the bottom to the top of the section reflects that the hydrothermal input isthe largest in the lowermost portion of the section and gradually decreases upward. These geochemical characteris 2tics indicate that the cherts from the bottom of the Lower Cambrian in the Northern Tarim Basin should be de 2posited on a pelagic ocean - basin floor in proximity to the mid ocean ridge that provided much interior source/ hy 2drothermal input, but this conclusion is in quite contradiction to that from the sedimentological research. On thebasis of the comprehensive studiesof regional geology and geochemistry of black shales, it is considered that the up 2welling carries the substances formed in the pelagic ocean floor onto shelf to deposit, which results in the pelagicgeochmical characteristics of the bedded cherts deposited on shelf.
- chert,
- rare earth and trace elements,
- depositional environment,
- Northern Tarim Basin,

References

[1]	Murray R W. Chemical criteria to identify the depositional environment of chert: general principles and applications. Sedimentary Geology, 1994, 90: 213～232.
[2]	Murray R W, Buchholtz ten Brink M R, Jones D L, Gerlach D C and Russ G P. Rare earth elements as indicators of different marine depositional environments in chert and shale. Geology, 1990, 18: 268～271.
[3]	Murray R W, Buchholtz ten Brink M R, Gerlach D C, Russ G P and Jones D L. Rare earth, major and trace elements in chert from the Franciscan Complex and Monterey Group, California: assessing REE sources to fine-grained marine sediments. Geochimica Cosmochimica Acta, 1991, 55: 1875～1895.
[4]	Murray R W, Buchholtz ten Brink M R, Gerlach D C, and Russ G P and Jones D L. Interoceanic variation in the rare earth, major, and trace element depositional chemistry of chert: perspectives gained from the DSDP and ODP record. Geochimica et Cosmochimica Acta, 1992, 56: 1897～1913.
[5]	Fan Delian. Polyelements in the Lower Cambrian black shale series in southern China. In:Greecs S A ed. The significance of trace elements in solving petrogenetic problems and controversies. Theophrastus Publications, 1983.447～474.
[6]	Fan Delian, Yang Ruiying, Huang Zhongxiang. The Lower Cambrian black shale series and iridium anomaly in south China. In:Academia Sinica eds. Developments in geosciences, contribution to 27th IGC.Moscow, 1984.215～224.
[7]	范德廉,叶杰,杨瑞英,等. 扬子地台前寒武纪/寒武纪界线附近的地质事件与成矿作用.沉积学报, 1987, 5: 81～95 [Fan Delian, Ye Jie, Yang Ruiying,et al. The geological events and mineralization near the boundary line of Precambrian and Cambrian in Yangtze Platform. Acta Sedimentologica Sinica, 1987, 5: 81～95]
[8]	Chen Nansheng. Lower Cambrian black rock series and associated stratiform deposits in sothern China. Chinese Journal of Geochemistry, 1990, 9: 244～255
[9]	涂光炽. 华南元古宙基底演化与成矿作用.北京: 科学出版社, 1993 [Tu Guangzhi. The Basement Evolution and Mineralization of Proterozoic in South China. Beijing: Science Press, 1993]
[10]	涂光炽. 低温地球化学. 北京: 科学出版社, 1998. [Tu Guangzhi. The Low Temperature Geochemistry. Beijing: Science Press, 1998]
[11]	李胜荣,高振敏. 湘黔寒武系牛蹄塘组黑色岩系稀土元素特征-兼论海相热水沉积岩的稀土模式. 矿物学报, 1995, 15: 225～229 [Li Shengrong, Gao Zhenming. REE character of black rock series of Niutitang Formation in Hunan and Guizhou-simultaneous discussion on the REE model of hydrothermal rocks in sea facies. Acta Mineralogica Sinica, 1995, 15: 225～229]
[12]	李胜荣,高振敏. 湘黔下寒武统黑色岩系热演化条件. 地质地球化学, 1996, 4: 30～34 [Li Shengrong, Gao Zhenming. Conditions on thermal evolution of Lower Cambrian black rock series in Hunan and Guizhou. Geology-Geochemistry, 1996,4: 30～34]
[13]	Li Shengrong Gao Zhenming. Silicalites of hydrothermal origin in the lower Cambrian black rock series of south China. Chinese Journal of Geochemistry, 1996, 15: 113～120
[14]	Li Shengrong Gao Zhenming. Source tracing of noble metal elements in Lower Cambrian black rock series of Guizhou-Hunan Provinces, China. Science in China (Series D), 2000, 43: 625～632
[15]	于炳松,裘愉卓,李娟. 扬子地块西南部晚元古至三叠纪沉积地球化学演化.沉积学报, 1997, 15(4): 127～133 [Yu Bingsong, Qiu Yuzhuo, Li Juan. Sedimentary geochemical evolution from Upper Proterozoic to Triassic in southwest Yangtze Massif. Acta Sedimentologica Sinica, 1997, 15(4):127～133]
[16]	于炳松,裘愉卓. 扬子地块西南部晚元古代至三叠纪稀土元素地球化学及其地壳演化. 现代地质, 1998, 12(2): 173～179 [Yu Bingsong and Qiu Yuzhuo. REE geochemistry and crustal evolution from Upper Proterozoic to Triassic in southwest Yangtze Massif. Geoscience, 1998, 12(2): 173～179]
[17]	于炳松,乐昌硕. 沉积岩物质成分所蕴含的地球深部信息.地学前缘, 1998, 5(3): 105～112 [Yu Bingsong, Yue Changshuo. Some information about the interior of earth contained in composition of sedimentary rocks. Earth Science Frontiers, 1998, 5(3):105～112]
[18]	Yu Bingsong, Qiu Yuzhuo. The geochemistry of sedimentary rocks and its relation to crustal evolution in the southwest Yangtze Massif. Chinese Journal of Geochemistry, 1998, 17(3): 265～274
[19]	Yu Bingsong. Control of interior sources on time-bound characteristics of minerization in southwest Yangtze Massif. Journal of China University Geosciences, 1998, 10(1):80～85
[20]	Wedepohl K H. The composition of the continental crust. Geochim. Cosmochim. Acta, 1995,59: 1217～1232
[21]	McLennan S M and Taylor S R. Th and U in sedimentary rocks: crustal evolution and sedimentary recycling. Nature, 1980, 285: 621～624
[22]	McLennan S M, Taylor S R, McCulloch M T, and Maynard J B. Geochemical and Nd-Sr isotopic composition of deep-sea turbidites: Crustal evolution and plate tectonic associations. Geochimica et Cosmochimica Acta, 1990, 54: 2015～2052
[23]	McLennan S M and Taylor S R. Sedimentary rocks and crustal evolution: Tectonic setting and secular trends. Journal of Geology, 1991, 1: 1～21
[24]	Murray R W, Jones D L, and Buchholtz ten Brink M R. Diagenetic formation of bedded chert: evidence from chemistry of the chert-shale couple. Geology, 1992, 20: 271～274
[25]	Adachi M, Yamamoto K, Sugisaki. Hydrothermal chert and associated siliceous rock from the Northern Pacific: Their geological significance as indication of ocean ridge activity. Sedimentary Geology, 1986, 47: 125～148
[26]	Girty H G. Provenance and depositional setting of Paleozoic chert and argillite, Sierra Nevada, California. Journal of Sedimentary Research, 1996, 66: 107～118
[27]	Jafri S H, Balaram V and Govil P K. Depositional environments of Cretaceous radiolarian cherts from Andaman-Nicobar Islands, northeastern Indian.Ocean Marine Geology, 1993,12: 291～301
[28]	Kunzendorf K. Regional variation of REE pattern in sediments from active plate boundaries. Marine Geology, 1988, 84: 191～199
[29]	Mirchard V. Some geochemical indicators for discrimination between diagenetic and hydrothermal metalliferous sediments. Marine Geology, 1982, 50: 241～256
[30]	Michard A. Rare earth element systematics in hydrothermal fluids. Geochimica et Cosmochimica Acta, 1989, 53: 745～750
[31]	Rangin C, Steinberg M, Bonnot-Courtois C. Geochemistry of Mesozoic bedded cherts of Central Baja California (Vizcaino-Cedros-San Benito): implication for paleogeographic reconstruction of an old oceanic basin. Earth Planet Science Letter, 1981, 54: 313～322
[32]	Boynton W V. Cosmochemistry of the Rare Earth Elements. In: Henderson P ed. Rare Earth Element Geochemistry. Developments in Geochemistry 2. Elsevier, Amsterdam, 1984. 63～114
[33]	Haskin M A and Haskin L A. Rare earth in European shales: a redetermination. Science, 1966,154: 507～509
[34]	Shimizu H and Masuda A. Cerium in chert as an indication of marine environment of its formation. Nature, 1997, 266, 24: 346～348
[35]	Nagasawa H and Suwa K. Rare-earth concentrations in 3.5-billion-year-old Onverwacht cherts: An indicator for early Precambrian crustal environments. Geochemical Journal, 1986, 20: 253～260
[36]	Lottermoser B G. Rare earth element study of exhalites within the Willyama Supergroup, Broken Hill Block, Australia. Mineral. Deposita, 1989, 24: 92～99
[37]	乐昌硕,于炳松,田成,王荣前.新疆塔里木盆地北部层序地层及其沉积学研究.北京:地质出版社,1996 [Yue Changshuo, Yu Bingsong, Tian Cheng and Wang Rongqian. Study on Sequence Stratigraphy and Sedimentology in northern Tarim Basin. Beijing: Geological Publishing House, 1996]
[38]	L ckge A, Boussafir M, Lallier-Verges E, Littke R. Comparative study of organic matter preservation in immature sediments along the continental margins of Peru and Oman. Part, Results of petrographical and bulk geochemical data. Organic Geochemistry, 1996, 24: 437～451
[39]	Bordovskiy O K. Accumulation and transformation of organic substances in marine sediments, Part and. Marine Geology,1965, 3: 3～34
[40]	Premuzic E T, Benkovitz J S, Gaffrey J S, Walsh J J. The nature and distribution of organic matter in the surface sediments of the world oceans and seas. Organic Geochemistry, 1982, 4: 63～77
[41]	Suzuki N, Ishida K, Shinomiya Y, Ishiga H. High productivity in the earliest Triassic ocean: black shales, Southwest Japan. Palaeogeography, Palaeoclimatology, Palaeoecology,1998, 141: 53～65
[42]	Ganeshram R S, Pedersen T F, Calvert S E and Francols R. Reduced nitrogen fixation in the glacial ocean inferred from changes in marine nitrogen and phosphorus inventories. Nature, 2002, 415: 156～159

Proportional views

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Get Citation

PDF

XML

Article Metrics

Article views(796) PDF downloads(1007) Cited by()

Proportional views

Rare Earth and Trace Element Patterns in Bedded- cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China :Implication for Depositional Environments

1. China University of Geosciences,Beijing 100083;

2. Key Laboratory of Lithosphere Tectonics and Exploration, Ministry of Education, Beijing 100083

Received Date: 2002-09-05

Rev Recd Date: 2002-11-29

Publish Date: 2004-03-10

Key words:

Abstract: Black rock series at the bottom of the Lower Cambrian in the Northern Tarim Basin, China, is com 2posed of black shales interbedded with thin - bedded cherts. Six chert samples were systematically collected from avertical section of 8. 8 meters in depth in Xiaoerbulak, Northern Tarim Basin. The cherts were crushed and ana 2lyzed for trace element and rare earth concentrations. Trace elements such as V, Cu, Zn, U, Pb, Ba, Cd, Ag,Mo, As and Sb are highly enriched, and others such as Rb, Zr, Cs, Hf, Ta, W, Tl, Bi and Th are highly deplet 2ed in the cherts. These trace element patterns suggest that the cherts may be of deep crustal origin. The low ratiosof Th/ U and Rb/ Sr further suggest that the cherts are of earth interior sourcesor received hydrothermal input dur 2ing their deposition. The chondrite - normalized Ce/ Ce3ratio rangesfrom 0. 42 to 0. 83, with an average of 0. 60.North American Shale Composite (NASC) - normalized Ce/ Ce3ratio ranges from 0. 42 to 0. 79, with an averageof 0. 57. Negative Ce anomalies are distinct. ∑ REEs in the cherts generally increase from 10. 50 ppm at the bot 2tom to 35. 97 ppm at the top of the sampled section. NASC - normalized (La/ Lu) _N ratio decreases from 2. 72 atthe bottom to 0. 67 at the top. NASC - normalized (La/ Ce) _N ratio increases from 1. 36 at the bottom to 3. 13 atthe top. These REE patterns are very similar to those for the cherts deposited in the pelagic ocean - basin floor inthe Franciscan Complex exposed at Marin Headlands, California (F - MH chert) (Murray et al.,1991). Chon 2drite - normalized Eu/ Eu3value markedly decreases upward in the section from 5. 54 at the lowermost to 0. 73 atthe top, and NASC - normalized Eu/ Eu3value decreasesfrom 8. 05 to 1. 03. The relatively high Eu/ Eu3ratio forthe chertsfrom the North Tarim Basin is most likely due to a hydrothermal input (e. g., Eu/ Eu3 ～10). The sys 2tematic decrease of Eu/ Eu3ratio from the bottom to the top of the section reflects that the hydrothermal input isthe largest in the lowermost portion of the section and gradually decreases upward. These geochemical characteris 2tics indicate that the cherts from the bottom of the Lower Cambrian in the Northern Tarim Basin should be de 2posited on a pelagic ocean - basin floor in proximity to the mid ocean ridge that provided much interior source/ hy 2drothermal input, but this conclusion is in quite contradiction to that from the sedimentological research. On thebasis of the comprehensive studiesof regional geology and geochemistry of black shales, it is considered that the up 2welling carries the substances formed in the pelagic ocean floor onto shelf to deposit, which results in the pelagicgeochmical characteristics of the bedded cherts deposited on shelf.

HTML

Reference (42)

[1]	Murray R W. Chemical criteria to identify the depositional environment of chert: general principles and applications. Sedimentary Geology, 1994, 90: 213～232.
[2]	Murray R W, Buchholtz ten Brink M R, Jones D L, Gerlach D C and Russ G P. Rare earth elements as indicators of different marine depositional environments in chert and shale. Geology, 1990, 18: 268～271.
[3]	Murray R W, Buchholtz ten Brink M R, Gerlach D C, Russ G P and Jones D L. Rare earth, major and trace elements in chert from the Franciscan Complex and Monterey Group, California: assessing REE sources to fine-grained marine sediments. Geochimica Cosmochimica Acta, 1991, 55: 1875～1895.
[4]	Murray R W, Buchholtz ten Brink M R, Gerlach D C, and Russ G P and Jones D L. Interoceanic variation in the rare earth, major, and trace element depositional chemistry of chert: perspectives gained from the DSDP and ODP record. Geochimica et Cosmochimica Acta, 1992, 56: 1897～1913.
[5]	Fan Delian. Polyelements in the Lower Cambrian black shale series in southern China. In:Greecs S A ed. The significance of trace elements in solving petrogenetic problems and controversies. Theophrastus Publications, 1983.447～474.
[6]	Fan Delian, Yang Ruiying, Huang Zhongxiang. The Lower Cambrian black shale series and iridium anomaly in south China. In:Academia Sinica eds. Developments in geosciences, contribution to 27th IGC.Moscow, 1984.215～224.
[7]	范德廉,叶杰,杨瑞英,等. 扬子地台前寒武纪/寒武纪界线附近的地质事件与成矿作用.沉积学报, 1987, 5: 81～95 [Fan Delian, Ye Jie, Yang Ruiying,et al. The geological events and mineralization near the boundary line of Precambrian and Cambrian in Yangtze Platform. Acta Sedimentologica Sinica, 1987, 5: 81～95]
[8]	Chen Nansheng. Lower Cambrian black rock series and associated stratiform deposits in sothern China. Chinese Journal of Geochemistry, 1990, 9: 244～255
[9]	涂光炽. 华南元古宙基底演化与成矿作用.北京: 科学出版社, 1993 [Tu Guangzhi. The Basement Evolution and Mineralization of Proterozoic in South China. Beijing: Science Press, 1993]
[10]	涂光炽. 低温地球化学. 北京: 科学出版社, 1998. [Tu Guangzhi. The Low Temperature Geochemistry. Beijing: Science Press, 1998]
[11]	李胜荣,高振敏. 湘黔寒武系牛蹄塘组黑色岩系稀土元素特征-兼论海相热水沉积岩的稀土模式. 矿物学报, 1995, 15: 225～229 [Li Shengrong, Gao Zhenming. REE character of black rock series of Niutitang Formation in Hunan and Guizhou-simultaneous discussion on the REE model of hydrothermal rocks in sea facies. Acta Mineralogica Sinica, 1995, 15: 225～229]
[12]	李胜荣,高振敏. 湘黔下寒武统黑色岩系热演化条件. 地质地球化学, 1996, 4: 30～34 [Li Shengrong, Gao Zhenming. Conditions on thermal evolution of Lower Cambrian black rock series in Hunan and Guizhou. Geology-Geochemistry, 1996,4: 30～34]
[13]	Li Shengrong Gao Zhenming. Silicalites of hydrothermal origin in the lower Cambrian black rock series of south China. Chinese Journal of Geochemistry, 1996, 15: 113～120
[14]	Li Shengrong Gao Zhenming. Source tracing of noble metal elements in Lower Cambrian black rock series of Guizhou-Hunan Provinces, China. Science in China (Series D), 2000, 43: 625～632
[15]	于炳松,裘愉卓,李娟. 扬子地块西南部晚元古至三叠纪沉积地球化学演化.沉积学报, 1997, 15(4): 127～133 [Yu Bingsong, Qiu Yuzhuo, Li Juan. Sedimentary geochemical evolution from Upper Proterozoic to Triassic in southwest Yangtze Massif. Acta Sedimentologica Sinica, 1997, 15(4):127～133]
[16]	于炳松,裘愉卓. 扬子地块西南部晚元古代至三叠纪稀土元素地球化学及其地壳演化. 现代地质, 1998, 12(2): 173～179 [Yu Bingsong and Qiu Yuzhuo. REE geochemistry and crustal evolution from Upper Proterozoic to Triassic in southwest Yangtze Massif. Geoscience, 1998, 12(2): 173～179]
[17]	于炳松,乐昌硕. 沉积岩物质成分所蕴含的地球深部信息.地学前缘, 1998, 5(3): 105～112 [Yu Bingsong, Yue Changshuo. Some information about the interior of earth contained in composition of sedimentary rocks. Earth Science Frontiers, 1998, 5(3):105～112]
[18]	Yu Bingsong, Qiu Yuzhuo. The geochemistry of sedimentary rocks and its relation to crustal evolution in the southwest Yangtze Massif. Chinese Journal of Geochemistry, 1998, 17(3): 265～274
[19]	Yu Bingsong. Control of interior sources on time-bound characteristics of minerization in southwest Yangtze Massif. Journal of China University Geosciences, 1998, 10(1):80～85
[20]	Wedepohl K H. The composition of the continental crust. Geochim. Cosmochim. Acta, 1995,59: 1217～1232
[21]	McLennan S M and Taylor S R. Th and U in sedimentary rocks: crustal evolution and sedimentary recycling. Nature, 1980, 285: 621～624
[22]	McLennan S M, Taylor S R, McCulloch M T, and Maynard J B. Geochemical and Nd-Sr isotopic composition of deep-sea turbidites: Crustal evolution and plate tectonic associations. Geochimica et Cosmochimica Acta, 1990, 54: 2015～2052
[23]	McLennan S M and Taylor S R. Sedimentary rocks and crustal evolution: Tectonic setting and secular trends. Journal of Geology, 1991, 1: 1～21
[24]	Murray R W, Jones D L, and Buchholtz ten Brink M R. Diagenetic formation of bedded chert: evidence from chemistry of the chert-shale couple. Geology, 1992, 20: 271～274
[25]	Adachi M, Yamamoto K, Sugisaki. Hydrothermal chert and associated siliceous rock from the Northern Pacific: Their geological significance as indication of ocean ridge activity. Sedimentary Geology, 1986, 47: 125～148
[26]	Girty H G. Provenance and depositional setting of Paleozoic chert and argillite, Sierra Nevada, California. Journal of Sedimentary Research, 1996, 66: 107～118
[27]	Jafri S H, Balaram V and Govil P K. Depositional environments of Cretaceous radiolarian cherts from Andaman-Nicobar Islands, northeastern Indian.Ocean Marine Geology, 1993,12: 291～301
[28]	Kunzendorf K. Regional variation of REE pattern in sediments from active plate boundaries. Marine Geology, 1988, 84: 191～199
[29]	Mirchard V. Some geochemical indicators for discrimination between diagenetic and hydrothermal metalliferous sediments. Marine Geology, 1982, 50: 241～256
[30]	Michard A. Rare earth element systematics in hydrothermal fluids. Geochimica et Cosmochimica Acta, 1989, 53: 745～750
[31]	Rangin C, Steinberg M, Bonnot-Courtois C. Geochemistry of Mesozoic bedded cherts of Central Baja California (Vizcaino-Cedros-San Benito): implication for paleogeographic reconstruction of an old oceanic basin. Earth Planet Science Letter, 1981, 54: 313～322
[32]	Boynton W V. Cosmochemistry of the Rare Earth Elements. In: Henderson P ed. Rare Earth Element Geochemistry. Developments in Geochemistry 2. Elsevier, Amsterdam, 1984. 63～114
[33]	Haskin M A and Haskin L A. Rare earth in European shales: a redetermination. Science, 1966,154: 507～509
[34]	Shimizu H and Masuda A. Cerium in chert as an indication of marine environment of its formation. Nature, 1997, 266, 24: 346～348
[35]	Nagasawa H and Suwa K. Rare-earth concentrations in 3.5-billion-year-old Onverwacht cherts: An indicator for early Precambrian crustal environments. Geochemical Journal, 1986, 20: 253～260
[36]	Lottermoser B G. Rare earth element study of exhalites within the Willyama Supergroup, Broken Hill Block, Australia. Mineral. Deposita, 1989, 24: 92～99
[37]	乐昌硕,于炳松,田成,王荣前.新疆塔里木盆地北部层序地层及其沉积学研究.北京:地质出版社,1996 [Yue Changshuo, Yu Bingsong, Tian Cheng and Wang Rongqian. Study on Sequence Stratigraphy and Sedimentology in northern Tarim Basin. Beijing: Geological Publishing House, 1996]
[38]	L ckge A, Boussafir M, Lallier-Verges E, Littke R. Comparative study of organic matter preservation in immature sediments along the continental margins of Peru and Oman. Part, Results of petrographical and bulk geochemical data. Organic Geochemistry, 1996, 24: 437～451
[39]	Bordovskiy O K. Accumulation and transformation of organic substances in marine sediments, Part and. Marine Geology,1965, 3: 3～34
[40]	Premuzic E T, Benkovitz J S, Gaffrey J S, Walsh J J. The nature and distribution of organic matter in the surface sediments of the world oceans and seas. Organic Geochemistry, 1982, 4: 63～77
[41]	Suzuki N, Ishida K, Shinomiya Y, Ishiga H. High productivity in the earliest Triassic ocean: black shales, Southwest Japan. Palaeogeography, Palaeoclimatology, Palaeoecology,1998, 141: 53～65
[42]	Ganeshram R S, Pedersen T F, Calvert S E and Francols R. Reduced nitrogen fixation in the glacial ocean inferred from changes in marine nitrogen and phosphorus inventories. Nature, 2002, 415: 156～159

Rare Earth and Trace Element Patterns in Bedded- cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China :Implication for Depositional Environments

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Proportional views

Related