揚(yáng)子地臺(tái)下寒武統(tǒng)不同相區(qū)碳同位素分析環(huán)境變化和對(duì)比研究

郭慶軍

摘 要：本研究提供揚(yáng)子地臺(tái)埃迪卡拉系-寒武系轉(zhuǎn)折期不同相區(qū)（碳酸鹽相、斜坡相、深水相）碳同位素?cái)?shù)據(jù)及其變化趨勢(shì)和規(guī)律，不但是為不同相區(qū)界線劃分和對(duì)比提供依據(jù)，特別是深水相無(wú)法用化石開(kāi)展地層對(duì)比，本研究彌補(bǔ)了揚(yáng)子地區(qū)對(duì)于斜坡相到深水區(qū)沒(méi)有系統(tǒng)研究的空白。本研究的有機(jī)碳同位素組成結(jié)果，不但運(yùn)用于埃迪卡拉-寒武交變期古環(huán)境的探討，而且可以作為揚(yáng)子地臺(tái)乃至全球界線劃分和對(duì)比的重要工具。

關(guān)鍵詞：埃迪卡拉世-早寒武世轉(zhuǎn)折期 碳同位素 不同相區(qū) 揚(yáng)子地臺(tái)

Abstract：Carbon isotope data from carbonate， via slope to basinal belts across the Ediacaran–Cambrian transition on the Yangtze Platform， South China record secular variations in carbon isotopes. Data supplement highly comparable carbon isotope profiles from time equivalent shallow water， shelf and slope settings. No environmentally determined carbon isotope gradient across the Yangtze Platform is discernible， suggesting that a transgressive anoxic event provided an isotopically homogenous carbon source for primary productivity that originated from the deeper part of an anoxic and/or sulfidic basin. Data from this study provide blank for basinal belt， and can be used for paleoenvironment， divisition and correlation of boundary of Yangtze Platform， even world.

Keywords：Ediacaran–Cambrian transition；Carbon isotope；Different belts；Yangtze Platform

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