边千韬1, 朱士兴2, I. I. Pospelov3, M. A. Semikhatov3, 孙淑芬2, 陈代钊1, 那春光1
1. 中国科学院地质与地球物理研究所, 北京, 100029; 2. 中国地质调查局天津地质矿产研究所, 天津, 300170; 3. Geological Institute, Russian Academy of Sciences, Moscow 109017, Russia
DISCOVERY OF LATE MESOPROTEROZOIC—EARLY NEOPROTEROZOIC STROMATOLITE ASSEMBLAGE IN THE SOUTHERN BELT OF EASTERN KUNLUN
Bian Qiantao1, Zhu Shixing2, I. I. Pospelov3, M. A. Semikhatov3, Sun Shufen2, Chen Daizhao1, Na Chunguang1
1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029; 2. Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170; 3. Geological Institute, Russian Academy of Sciences, Moscow 109017, Russia
This paper reported, for the first time, a newly discovered Late Mesoproterozoic—Early Neoproterozoic stromatolite assemblage, named the “Jiawengmen stromatolite assemblage”, represented by the Conophyton-Baicalia group in Jiawenmen area, the southern belt of the eastern Kunlun. The stromatolite assemblage was dominated by large-scale conical stromatolites and related elements, i.e., Conophyton garganicusvar. inkeni, C. cf. ressoti Menchikov, Jacutophyton f. and Conicodomenia f., which commonly co-existed with elements of the group of Baicalia. This assemblage could be correlated with that of the Middle Jixian System—Middle Qingbaikou System in North and Northwest China, but different from that in South China. It could also be correlated with that in the upper horizon of the Middle Riphean—lower horizon of the Upper Riphean in South Ural Mountains and Siberia of Russia, North Africa, and Alaska Peninsula. These facts suggested that the Jiawengmen stromatolite assemblage probably colonized during 1 300～850 Ma ago. Accordingly, the stromatolite-bearing carbonate rocks were then proposed to correspond to the Middle Jixian System—Middle Qingbaikou System or the upper Middle Riphean—lower Upper Riphean. Our stromatolite data further revealed that a Precambrian microblock, named the Maqen Microblock, likely occurred in the southern belt of the eastern Kunlun. Similar stromatolite assemblages in the Maqen microblok and those blocks that occurred in the North China, Siberia and North Africa pointed to a similar palaeogeographic and palaeoenvironmental condition. These microblok and blocks were likely located at low-latitudes and on the continental margin of the Rodinian supercontinent, where warm epicontinental seas were favorable to widespread colonization of stromatolites during the Late Mesopro—terozoic—Early Neoproterozoic. However, the stromatolite assemblage was quite different from those of South China Block, suggesting different palaeogeographic contexts, probably of different tectonic affinity as well.
边千韬,朱士兴,I. I. Pospelov等. 2006, 东昆仑南带中元古代晚期—新元古代早期叠层石组合的发现. 地质科学, (3): 500-510.
Bian Qiantao,Zhu Shixing,I. I. Pospelov et al. DISCOVERY OF LATE MESOPROTEROZOIC—EARLY NEOPROTEROZOIC STROMATOLITE ASSEMBLAGE IN THE SOUTHERN BELT OF EASTERN KUNLUN[J]. Chinese Journal of Geology, 2006, (3): 500-510.