M icrospar Structure Carbonate and Constrain of Sedimentary Facies and Environments in Jiangsu, Anhui and Liaoning Provinces of the Northern China

LIU Yong-qing; GAO Lin-zhi; LIU Yan-xue

Microspar structures represented by complex ptygmatically folded, dotted lags, blobs or vertical and horizontal ribbons and ve ins are common in Pro terozo ic carbona tesw orldw ide. Microspar structures be ing filled by fine,equant sparry calcite (ordolomite) crystals display sharpen lateral boundaries with hosting rocks composed dominantly of limemud or fine-grained carbonatesw ith quartz silt& clay occasionally and tempestites-carbonaceous tubidite rhythmites with m icrospar veins and microspar-intrac last lags in the middle and upper. Microspar structure lim estones are mainly deposited on a remarkab ly ramp carbonate platform, and common with tidal and storm current plane and graded beddings, rhythm ites with scalloped erosional surfaces and depositional filled structures in m icrosparbearing carbonates. Occurence of microspar structure are identically constra ined with in shallow subt idal and peritidal (in term of ramp,.i e., deep inner ramp to shallow m id-ramp), and storm-base in the ramp is the distal sea-floor lim it of m icrospar fo rmation. Vert ical successions o fm icrospar-bearing carbonate are stacked by high-frequency shallow subt idal and peritidal cyclic depositional micro-sequences, which show ing a cycle of thinning, shallowing and depositional dynamic decreasing-upward, and with a peritidal cap of red iron and organic carbonaceous lam inite attrited to sabuha-like m icro facies on the top of individual cycles.

Chinese Academy of Geological Sciences, Beijing 100037

Received Date: 2004-04-09

Rev Recd Date: 2004-06-24

Publish Date: 2005-03-10

Key words:

Abstract: Microspar structures represented by complex ptygmatically folded, dotted lags, blobs or vertical and horizontal ribbons and ve ins are common in Pro terozo ic carbona tesw orldw ide. Microspar structures be ing filled by fine,equant sparry calcite (ordolomite) crystals display sharpen lateral boundaries with hosting rocks composed dominantly of limemud or fine-grained carbonatesw ith quartz silt& clay occasionally and tempestites-carbonaceous tubidite rhythmites with m icrospar veins and microspar-intrac last lags in the middle and upper. Microspar structure lim estones are mainly deposited on a remarkab ly ramp carbonate platform, and common with tidal and storm current plane and graded beddings, rhythm ites with scalloped erosional surfaces and depositional filled structures in m icrosparbearing carbonates. Occurence of microspar structure are identically constra ined with in shallow subt idal and peritidal (in term of ramp,.i e., deep inner ramp to shallow m id-ramp), and storm-base in the ramp is the distal sea-floor lim it of m icrospar fo rmation. Vert ical successions o fm icrospar-bearing carbonate are stacked by high-frequency shallow subt idal and peritidal cyclic depositional micro-sequences, which show ing a cycle of thinning, shallowing and depositional dynamic decreasing-upward, and with a peritidal cap of red iron and organic carbonaceous lam inite attrited to sabuha-like m icro facies on the top of individual cycles.

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[1]

1 FurnissG,Rittel J F,Winston D. Gas bubble and expansion crack origin of molar-tooth calcite structures in the Middle Proterozoic Belt Supergroup, Western Montana[J].Journal of Sedimentary Research,1998.104-114.

2 WinstonD,Rittel J F,Furniss G. Gas bubble and expansion crack origin of molar-tooth calcite structures in the Middle Proterozoic Belt Supergroup, western Montana-Reply[J].Journal of Sedimentary Research,1999,(02):437-462.

3 SmithAG. The origin and deformation of some molar-tooth structures in the Precambrian Belt-Purcell Supergroup[J].Journal of Geology,1968.426-443.

4 O'ConnerMP. Classification and environmental interpretation of the cryptalgal organosedimentarymolar-toothstructure of the Precambrian Belt-Purcell Supergroup[J].Journal of Geology,1972.592-610. PrattR. Seismites in the Mesoproterozoic Atlyn Formation (Belt Supergroup) Montana:a test for tectonic control of peritidal carbonate cyclicity[J].Geology,1994.1091-1094.

5 PrattR. Syneresis cracks: subaqueous shrinkage in argillaceous sediments caused by earthquake induced dewatering[J].Sedimentary Geology,1998.1-10.

6 PrattR. Gas bubble and expansion crack origin of molar-tooth calcite structures in the middle Proterozoic Belt Supergroup, western Montana -Discussion[J].Journal of Sedimentary Research,1998.1136-1140.

7 PrattR. Oceanography, bathymetry and syndepositional tectonics of a Precambrian intracratonic basin: integrating sediments, storms, earthquakes and tsunamis in the Belt (Helena Formation, C 145 Ga), western North America[J].Sedimentary Geology,2001.371-394.

8 FairchildIJ,Einsele G,Song T R. Possible seismic origin of molar-tooth structures in Neoproterozoic carbonate ramp deposits,north China[J].Sedimentology,1997.611-636.doi:10.1046/j.1365-3091.1997.d01-40.x.

9 FairchildIJ,Spiro B. Petrological and isolopic implications of some contrasting Late Precambrian carbonates, NE Spitsbergen[J].Sedimentology,1987.973-989.doi:10.1111/j.1365-3091.1987.tb00587.x.

10 ShieldsAS. Molar-tooth microspar:a chemical explanation for its disappearance-700Ma[J].Terra Nova,2002,(02):108-113.

11 乔秀夫,高林志. 华北中新元古代及早古生代地震灾变事件及与Rodinia的关系[J].Chinese Science Bulletin,1999,(16):1753-1756.doi:10.3321/j.issn:0023-074X.1999.16.015.

12 乔秀夫,高林志,彭阳. 古郯庐带新元古界-灾变·层序·生物[M].北京:地质出版社,2001.1-128.

13 MengXH,Ge M. The sedimentary features of Preterozoic microsparmolar-tooth carbonates in China and their significance[J].Episodes,2002,(03):185-195.

14 MengXH. Recent advance in Precambrian carbonate sedimentary geology; Report on International Conference of IGCP 447 on Molar tooth carbonates and evolution of the Earth in the Proterozoic[J].Episodes,2003,(01):28-29.

15 葛铭,孟祥化,旷红伟. 微亮晶(臼齿)碳酸盐岩:21世纪全球地学研究的新热点[J].沉积学报,2003,(01):81-89.doi:10.3969/j.issn.1000-0550.2003.01.013.

16 JamesNP,Narbonne G M,Sherman A G. Molar-tooth carbonates: shallow subtidal facies of the Mid-to Late Neoproterozoic[J].Journal of Sedimentary Research,1998.716-722.

17 FrankTD,Lyons T W. 'Molar-tooth' structures:a geochemical perspective on a Proterozoic enigma[J].Geology,1998.683-686.

18 urchetteTP,Wright V P. Carbonate ramp depositional system[J].Sedimentary Geology,1992.3-57.

19 刘燕学,旷红伟,蔡国印. 辽南新元古代营城子组臼齿灰岩的沉积环境[J].地质通报,2003,(06):419-425.doi:10.3969/j.issn.1671-2552.2003.06.007.

M icrospar Structure Carbonate and Constrain of Sedimentary Facies and Environments in Jiangsu, Anhui and Liaoning Provinces of the Northern China

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