华南地区一个密西西比时期含煤单元的沉积产地和古地理环境:来自碎屑锆石U-Pb年龄以及沉积学和地球化学证据的制约因素

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Yuliang Mu, Rongsong Tian, Yong Fu, Li Yang, Jiang Hu
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引用次数: 0

摘要

华南地区的密西西比系香柏地层是中国最古老的含煤沉积单元之一。然而,该含煤地层的沉积成因、古地理和成煤模式并没有得到很好的解释。我们结合使用了碎屑锆石 U-Pb 数据、泥岩和页岩的地球化学分析、钻探数据以及野外地质观测数据,解决了这一关键问题。除了研究区东部的早古生代造山运动事件(约 440-420 Ma)之外,湘白地层的样品表现出相似的非铁质锆石 U-Pb 年龄分布,主要年龄峰值约为 980-960 Ma,并有几个年龄峰值。锆石U-Pb年龄分布相似,主要年龄峰值约为980-960 Ma,几个次要年龄峰值约为800-780 Ma和600-500 Ma。800-780和600-500 Ma。这些锆英石碎屑主要来自循环沉积单元。野外和钻探资料显示,湘白地层形成于潮平带环境中,水深由下而上逐渐增加,显示出整体的横断趋势。密西西比系祥柏地层沉积于间冰期。湘白下统沉积在相对寒冷的古气候中,逐渐向上过渡到温暖湿润的气候,为煤炭的形成创造了有利条件。气候的冷暖交替引发了高频率的阵风波动,从而导致了多次沉积循环,并在湘白地层中形成了薄而不稳定的煤层。密西西比沉积古地理、古气候和沉积成因共同主导了华南西南部的含煤碎屑沉积。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sedimentary provenance and paleogeographic environment of a Mississippian coal-bearing unit in South China: Constraints from detrital zircon U-Pb ages and sedimentologic and geochemical evidence
The Mississippian Xiangbai Formation in South China is one of the oldest coal-bearing sedimentary units in China. However, the sedimentary provenance, paleogeography, and coal formation patterns of the coal-bearing strata are not well constrained. We address this key issue by using a combination of detrital zircon U-Pb data, geochemical analyses of mudstone and shale, drilling data, and geologic field observations. With the exception of the early Paleozoic orogenic events (ca. 440–420 Ma) in the eastern part of the study area, the samples from the Xiangbai Formation exhibit similar detrital zircon U-Pb age distribution with major age peaks at ca. 980–960 Ma and several subordinate age peaks at ca. 800–780 and 600–500 Ma. These detrital zircon grains mainly originated from recycled sedimentary units. Field and drilling data reveal that the Xiangbai Formation was formed in a tidal flat environment with water depth gradually increasing from the bottom to the top, indicating an overall trend of transgression. The Mississippian Xiangbai Formation was deposited in an interglacial period. The Lower Xiangbai Formation was deposited in a relatively cold paleoclimate, gradually transitioning upwards to a warm and humid climate, creating favorable conditions for coal formation. The alternation of warming and cooling climates triggered high-frequency eustatic fluctuations, which led to multiple sedimentary cycles and resulted in thin, unstable coal seams within the Xiangbai Formation. Mississippian sedimentary paleogeography, palaeoclimate, and sedimentary provenance together dominate the coal-bearing clastic sediments in southwestern South China.
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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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