|Table of Contents|

Geochemistry Characteristics of Cherts from Ordovician Nanjinguan Formation Limestone in the Eastern Yangtze Gorges Area of Hubei, China and Their Implications for Sedimentary Environment(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2020年第04期
Page:
464-478
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Geochemistry Characteristics of Cherts from Ordovician Nanjinguan Formation Limestone in the Eastern Yangtze Gorges Area of Hubei, China and Their Implications for Sedimentary Environment
Author(s):
ZHOU Bei-yu1;  LI Pan2;  ZENG Wen1*;  ZENG Wei1;  WANG Lei2;  LIU Yue2;  LIU Ying2
(1. Three Gorges Research Center for Geohazards of Ministry of Education, China University of Geosciences, Wuhan 430074, Hubei, China; 2. School of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China)
Keywords:
sedimentary environment;  petrogenesis;  chert;  limstone;  geochemistry;  Ordovician;  Nanjinguan Formation;  Hubei
PACS:
P595
DOI:
10.19814/j.jese.2020.01028
Abstract:
The eastern Yangtze Gorges area in Hubei belongs to the Upper Yangtze block of South China plate. The cherts from Ordovician Nanjinguan Formation limestone in this area are mostly developed as nodules and strips. Based on the detailed field geological survey, the petrography and geochemistry characteristics of these cherts were analysed, and the genesis and sedimentary environment were discussed. The results show that the main mineral compositions of cherts are quartz and chalcedony. Cherts are poor in Mn and Fe, the ratios of A1/(Al+Fe+Mn)range from 0.27 to 0.84 with an average of 0.64, which is closer to that of the biogenic cherts. The ratio of MnO/TiO2 is much less than 0.5, indicating cherts in this area form in the shallow sea sedimentary environment near the edge of the land. The ratios of Th/U range from 0.02 to 0.86 with an average of 0.24. Cherts have low REE content, the total REE content is(0.67-27.79)×10-6. The NASC-normalized REE pattern shows a relatively gentle right-leaning trend. The δCe ranges from 0.97 to 1.19 with an average of 1.11, and the average value of(La/Yb)N is 1.31, reflecting a bio-chemical origin rather than hydrothermal origin, and cherts form in a setting of continental margin. The carbon and oxygen isotope information of the host limestone of cherts in Nanjinguan Formation shows that the δ13C ranges from -2.37‰ to 2.30‰ with an average of -0.006 4‰, the δ18O ranges from -9.04‰ to -6.49‰ with an average of -7.61‰. The paleoenvironmental temperature varies from 4 ℃ to 21 ℃. The geochemistry characteristics of cherts in Nanjinguan Formation limestone indicate that cherts are biogenic origin and form in a warm and anoxic continental marginal tectonic settings.

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Last Update: 2020-07-27