本文選題：地質(zhì)事件　切入點：巖相　出處：《地球科學(xué)》2017年07期

【摘要】：上揚子地區(qū)廣泛發(fā)育上奧陶統(tǒng)五峰組和下志留統(tǒng)龍馬溪組富有機質(zhì)頁巖,前人研究較少涉及其巖相類型和沉積過程對主要地質(zhì)事件的響應(yīng).細粒沉積物高精度層序地層學(xué)研究表明,晚奧陶世至龍一段充填沉積期,經(jīng)歷了3次大的地質(zhì)事件,形成了2個三級層序(五峰組層序Sq1和龍一段層序Sq2)、12個準層序組和13個筆石帶.在生物地層約束的等時格架中,識別出火山噴發(fā)事件形成的富碳、富有機硅的硅質(zhì)頁巖相,底流侵入事件及陸源輸入濁流事件沉積的貧碳、貧有機硅的混合質(zhì)頁巖相和泥質(zhì)頁巖相,建立了五峰組-龍馬溪組富有機質(zhì)頁巖的成因模式,該套頁巖主要為該時期的火山噴發(fā)(包括冰期和生物絕滅)、底流侵入和陸源輸入等地質(zhì)事件導(dǎo)致的古氣候、古海洋等各要素協(xié)同作用的結(jié)果.
[Abstract]:The Wufeng formation of Upper Ordovician and the Longmaxi formation of Lower Silurian are rich in organic matter shale in Upper Yangtze area. Previous studies have rarely involved the response of lithofacies types and sedimentary processes to major geological events. High-precision sequence stratigraphic studies of fine-grained sediments show that the filling sedimentary period from late Ordovician to Long-1 member has experienced three major geological events. Two third-order sequences (Wufeng sequence Sq1 and Longyi formation sequence Sq2N, 12 quasi-sequence formations and 13 graptolite zones) were formed. In biostratigraphic isochronous framework, the siliceous shale facies rich in carbon and organic silicon formed by volcanic eruptions were identified. A genetic model of organic shale rich in Wufeng formation and Longmaoxi formation is established, which is composed of low carbon, mixed shale facies and shale-shale facies deposited by the underflow intrusive events and terrestrial turbidite events, and the muddy shale facies, which are rich in organic silicon, are formed in the formation of Wufeng formation and Longmaxi formation. The shale series is mainly the result of the synergistic action of various elements such as paleoclimate and paleo-ocean caused by volcanic eruptions (including glacial and biological extinction, underflow intrusion and land-based input, etc.) during this period.
【作者單位】： 中國地質(zhì)大學(xué)資源學(xué)院;
【基金】：國家自然科學(xué)基金重大項目(No.41690131) 國家科技重大專項(No.2016ZX05060-004)
【分類號】：P512.2;P535

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