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TIAN Yang, ZHAO Xiao-ming, WANG Ling-zhan, TU Bing, XIE Guo-gang, ZENG Bo-fu. Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1035-1045.
Citation: TIAN Yang, ZHAO Xiao-ming, WANG Ling-zhan, TU Bing, XIE Guo-gang, ZENG Bo-fu. Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1035-1045.

Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing

  • Received Date: 2013-11-14
  • Rev Recd Date: 2014-02-21
  • Publish Date: 2014-12-10
  • Observations from outcrop, thin sections and geochemical analyses of limestone samples collected from Middle Permian Qixia Formation at Jinlingxiang section in Shizhu, Chongqing City, make it possible to reveal characteristics of geochemistry and paleoenvironment. The 10 samples have low contents in SiO2 (<5%), MgO(<2.5%), low ratios of Mn/Sr(<0.1), Fe/Sr(<1), high contents in Sr(average: 1 751×10-6), δ18OPDB(>-10‰), meanwhile, SiO2 are strong positive correlated with MgO, which imply that samples have not experienced intense dolomitization and silicification implying no alteration on the chemical nature during diagenetic processes. Thus, they could be used as reliable objects to reconstruct paleoenvironment. Samples are usually high in CaO (average:53.81%) content, low in Na2O(average: 0.051%), Al2O3(average: 0.17%), TiO2(average: 0.012%)contents, which indicate stable marine paleoenvironment barely with terrigenous input. Low ratios of MgO/CaO(average:0.026), high ratios of 100×(MgO/Al2O3) (average:1241), Sr/Ba(average:286) integrated with 1 000×(Sr/Ca) (average:4.54) hint that Qixia Formation deposited in continental shelf (far shore) under humid climate. Geochemical indices for palaeoredox conditions, for example, U/Al, V/Al, Mo/Al, Cr/Al, Co/Al, V/(V+Ni) and U/Th, conform that the carbonate successions in the study area were accumulated in a dysaerobic-anaerobic environment. Terrestrial elements Σ(Al2O3+TiO2) contents decrease gradually, seawater depth indices: ratios of Sr/Ba and 1 000×(Sr/Ca) increase steadily from bottom to top, which reflect the coast were further away, terrigenous supply reduced gradually and sea level continued rising during deposition.
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  • Received:  2013-11-14
  • Revised:  2014-02-21
  • Published:  2014-12-10

Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing

Abstract: Observations from outcrop, thin sections and geochemical analyses of limestone samples collected from Middle Permian Qixia Formation at Jinlingxiang section in Shizhu, Chongqing City, make it possible to reveal characteristics of geochemistry and paleoenvironment. The 10 samples have low contents in SiO2 (<5%), MgO(<2.5%), low ratios of Mn/Sr(<0.1), Fe/Sr(<1), high contents in Sr(average: 1 751×10-6), δ18OPDB(>-10‰), meanwhile, SiO2 are strong positive correlated with MgO, which imply that samples have not experienced intense dolomitization and silicification implying no alteration on the chemical nature during diagenetic processes. Thus, they could be used as reliable objects to reconstruct paleoenvironment. Samples are usually high in CaO (average:53.81%) content, low in Na2O(average: 0.051%), Al2O3(average: 0.17%), TiO2(average: 0.012%)contents, which indicate stable marine paleoenvironment barely with terrigenous input. Low ratios of MgO/CaO(average:0.026), high ratios of 100×(MgO/Al2O3) (average:1241), Sr/Ba(average:286) integrated with 1 000×(Sr/Ca) (average:4.54) hint that Qixia Formation deposited in continental shelf (far shore) under humid climate. Geochemical indices for palaeoredox conditions, for example, U/Al, V/Al, Mo/Al, Cr/Al, Co/Al, V/(V+Ni) and U/Th, conform that the carbonate successions in the study area were accumulated in a dysaerobic-anaerobic environment. Terrestrial elements Σ(Al2O3+TiO2) contents decrease gradually, seawater depth indices: ratios of Sr/Ba and 1 000×(Sr/Ca) increase steadily from bottom to top, which reflect the coast were further away, terrigenous supply reduced gradually and sea level continued rising during deposition.

TIAN Yang, ZHAO Xiao-ming, WANG Ling-zhan, TU Bing, XIE Guo-gang, ZENG Bo-fu. Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1035-1045.
Citation: TIAN Yang, ZHAO Xiao-ming, WANG Ling-zhan, TU Bing, XIE Guo-gang, ZENG Bo-fu. Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1035-1045.
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