Research Sedimentary Microfacies of the Longwangmiao Formation in Moxi Area, Central Sichuan Basin
doi: 10.14027/j.cnki.cjxb.2015.05.013
- Received Date: 2014-05-27
- Rev Recd Date: 2014-11-23
- Publish Date: 2015-10-10
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Key words:
- sedimentary microfacies /
- grain shoal /
- sedimentary evolution model /
- Longwangmiao Formation /
- Moxi area
Abstract: Combined with the depositional background of Early Cambrian Longwangmiao Formation in Sichuan Basin, the lithology, sedimentary structures, logging response, microfacies and sedimentary evolution of Longwangmiao Formation in Moxi area were analyzed. It is indicated that in Longwangmiao period, the Moxi area was located in the restricted platform, and the Longwangmiao Formation was composed of dolarenites and crystalline dolomites deposited in the restricted lagoon and grain shoal. Vertically, Longwangmiao Formation was composed of two sets of up-shallowing deposition, from restricted lagoon to the grain shoals. Grain shoal can be subdivided into shoal core, shoal margin and inter-shoal low according to the lithology, sedimentary structures, cumulative thickness of grain dolomite and the grain dolomite thickness of the single shoal. Horizontally, the sedimentary distribution of the Upper Longwangmiao Formation is similar to that of the Lower Longwangmiao Formation, but the shoal scale had been larger with the eastward migration trends. The microfacies distribution is controlled by the palaeogeography characteristic and relative sea-level. The sedimentary evolution model of Longwangmiao Formation in Moxi area has been established.
Citation: | YANG XueFei, WANG XingZhi, TANG Hao, JIANG Nan, YANG YueMing, XIE JiRong, LUO WenJun. Research Sedimentary Microfacies of the Longwangmiao Formation in Moxi Area, Central Sichuan Basin[J]. Acta Sedimentologica Sinica, 2015, 33(5): 972-982. doi: 10.14027/j.cnki.cjxb.2015.05.013 |