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C-isotope composition and significance of the Sinian on the Tarim plate

机译：塔里木板块震旦系的C同位素组成及意义

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摘要

102 samples of limestones, mudrocks shales and tillites from the Sinian in Kuluketage have been analyzed. Four formations in the Sinian belong to glacial deposits in which the differences in δ~(13)C are distinct (-14.7 per thousand—+4.2per thousand). Distinctly negative δ~(13)C excursions for three times support the view of three glacial deposits in this area suggested by previous authors, except for the durations of them. δ~(13)C values are generally positive in the Beiyixi Formation of lower part of the Lower Sinian, representing probably the rock records of a continental rift related to break-up of the Rodinian supercontinent. There are three times of distinct excursions of δ~(13)C curve in all strata. The first one is from positive values at the bottom to about —5 per thousand at the top of the Beiyixi Formation. The second one, from 0 per thousand—3 per thousand in the Arletonggou Formation of upper part of the Lower Sinian to -3.4 per thousand— -14.4per thousand in the Teruiaiken Formation. The third one, from positive values in the Zhamoketi Formation of lower part of the Upper Sinian to negative values in glacial varves at the top of the Hankeerqiaoke Formation.
机译：对来自库鲁克塔奇震旦纪的102份石灰石，泥岩页岩和层状岩样品进行了分析。震旦纪的四个岩层属于冰川沉积，其中δ〜（13）C的差异非常明显（-14.7 /千-+ 4.2 /千）。 δ〜（13）C偏移为3倍的明显负值支持了先前作者提出的该地区三处冰川沉积的观点，但其持续时间除外。下震旦纪下部北一西组的δ〜（13）C值一般为正，可能代表与罗迪尼超大陆破裂有关的大陆裂谷的岩石记录。在所有地层中，δ〜（13）C曲线有3次不同的偏移。第一个是从底部的正值到北一溪组顶部的每千分之5左右。第二个，从下震旦统Arletonggou组的千分之三到千分之三，到Teruiaiken组的千分之三-3.4至一千分之-14.4。第三个是从上震旦统下部Zhamoketi组的正值到Hankeerqiaoke组顶部的冰川的负值。

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