新疆北部晚泥盆世至早石炭世生物群与环境的依存关系

This project is mainly composed of two parts. First part is to study the biota and their environment dependencies. Based on the study of the biodiversity from the Late Devonian to Early Carboniferous in northern Xinjiang, like brachiopods, conodonts, corals, crinoids, blastoids, radiolarians and so on, the biota characters, evolutionary patterns and the relations between biota and environment will be probed. These studies can provide more evidence and explanation why abundant faunas could live in the northern Xinjiang during or after the F-F Mass Extinction Event happened, then give some reasonable and sicentific evidence to the study of the biota's extinction, recovery and radiation. The second part to study the regional high resolution biostratigraphy around the Hoxtolgay area in northern Xinjiang. Through these studies, more basical information regarding the base position of the Upper Devonian Hongguleleng Formation, its regional distribution, the contact relationship of the Hongguleleng Formation with overlying and underlying beds, and the age of the Hebukehe Formation can be clearly understood. So that normal stratigraphic succession of strata can be recovered and detail regional stratigraphic correlation systems can be established in the northern Xinjiang. Based on the analysis and studies of high resolution biostratigraphy from the Upper Devonian Hongguleleng Formation to Early Carboniferous beds, sedimentary procedure and the the relations between biota and environment can be understood, and these studies also can give more solid sicentific foundation for the research of the environmentary background of many faunas during or after F-F biotic event in the northern Xinjiang.

内容和意义：1.通过新疆北部上泥盆统至下石炭统化石生物多样性研究，探讨F-F生物灭绝事件前后该地区生物群的特征和演变规律、不同生物群与环境之间的依存关系，对灭绝事件发生期间众多生物群在该地区得以"安然无恙"生存下来的环境背景、生物与环境之间的相互作用，提出新的认识和演化模式；继而对生物灭绝、复苏和辐射等热点问题的研究，提出更多有价值的科学依据；2.运用高分辨率地层学的研究方法，开展新疆北部和什托洛盖周边地区晚泥盆世至早石炭世生物地层研究，恢复该地区真实的沉积过程,了解上泥盆统洪古勒楞组区域性分布的状况,确定该组与下伏和上覆地层的接触关系,解决和布克河组时代和归属等关键性问题，细化和完善该地区生物地层研究，建立区域性地层对比系统。高分辨率地层学工作的深入开展，对恢复该地区正常的地层层序,正确判断生物与环境之间的依存关系，解释F-F灭绝事件前后不同生物群生活的环境背景,可以提供扎实的研究基础.

本项目自实施以来，取得如下一些进展：.1. 对新疆北部地区上泥盆统至下石炭统化石的生物多样性有了进一步的认识。晚泥盆世F-F生物集群灭绝事件在新疆北部表现并不明显，仍产出种类丰富的大量化石，是F-F生物集群灭绝时期一个罕见的生物“避难所”。本项目在新疆北部采集了丰富的腕足类、四射珊瑚、三叶虫等化石标本以及可供进行牙形刺研究的灰岩样品。腕足动物等生物群的研究进一步证实了新疆北部在晚泥盆世F-F集群灭绝时期生物“避难所”的存在，同时也深入分析了该地区这一时期的沉积环境，探讨了生物与环境之间的相互作用，并与华南地区进行了初步的对比和讨论。.2. 运用高分辨率地层学的研究方法，对新疆北部和什托洛盖周边地区晚泥盆世至早石炭世生物地层研究，分析了上泥盆统洪古勒楞组区域性分布的状况，讨论了该组与下伏和上覆地层的接触关系，为进一步解决和布克河组时代和归属等关键性问题提供生物地层方面的证据。