中文摘要：

从迟了的 Neoproterozoic Nantuo tillites 的 Diamictites (～ 6 00 妈) ，并且从在 Yangtze 区域的 overlying Dousantuo 和 Dengying 形成的白云石，南部的中国，为溶剂被分析可引出的烃。尽管所有这些样品有 TOC 的低内容并且在成熟热进化上经历了，有仍然保存了相当大量烃。由煤气的 chromatography-massspectrometry (GCMS ) 的摘录的分析揭示了 n 链烷的存在，常规非循环的 isoprenoids， tricyclicterpanes，惊讶格子， gammacerane， steranes，和 polyaromatic 烃。严格的试验性的大小在分析过程被执行阻止任何潜在的沾染物被介绍。所有这些沥青把前寒武纪的特征和没有外部 organics 的分子的标记从当前的污染事件导出或从更年轻的阶层移植了烃。为沥青的成熟参数显示烃具有在成熟上，它与主人岩石的热成熟一致。因而，这被结束在 Yangtze 区域的迟了的 Neoproterozoic 沥青，华南，对他们的主人岩石土生土长，它为我们关于“雪球土”的器官的 geochemical 研究提供基础并且“寒武纪的爆炸。''

英文摘要：

Diamictites from Late Neoproterozoic Nantuo tillites （-600 Ma）, and dolomites from the overlying Dousantuo and Dengying formations in the Yangtze region, southern China, were analyzed for solvent extractable hydrocarbons. Even though all these samples have low contents of TOC and have undergone overmature thermal evolution, there has been still preserved quite a large amount of hydrocarbons. Analysis of the extracts by gas chromatography-mass spectrometry （GC-MS） revealed the presence of n-alkanes, regular acyclic isoprenoids, tricyclic terpanes, hopanes, gammacerane, steranes, and polyaromatic hydrocarbons. Strict experimental measurements were performed in the analytical procedure to prevent any potential contaminants from being introduced. All these bitumens have molecular markers of Precambrian characteristics and no external organics derived from current contamination events or migrated hydrocarbons from younger strata. The maturity parameters for bitumens indicate that the hydrocarbons are of over-maturity, which is consistent with the thermal maturity of the host rocks. Consequently, it is concluded that the Late Neoproterozoic bitumens in the Yangtze region, South China, are indigenous to their host rocks, which provides the basis for our organic geochemical research on ＂Snowball Earth＂ and ＂Cambrian Explosion.＂