【摘要】：為深入分析椒江凹陷上古新統(tǒng)明月峰組物源,探索適用于海域的物源研究方法,對東海椒江凹陷的巖石組分、重礦物及碎屑鋯石U-Pb定年等數(shù)據(jù)進行物源綜合分析.結(jié)果顯示,凹陷東部明月峰組上段和下段的物源發(fā)生了改變,其下段物源主要來自凹陷東部的海礁隆起,以過渡弧-切割弧環(huán)境的酸性侵入巖為主,主要源巖時代為183~209Ma,有少量變質(zhì)巖及其他中生代火成巖貢獻(xiàn);至明月峰組上段沉積期,物源以過渡弧環(huán)境下的酸性噴出巖及侵入巖為主,碎屑鋯石年齡集中于106~116Ma,與圍區(qū)物源特征基本相同;結(jié)合沉積體系演化分析,表明整個椒江凹陷的物源來自西部的浙閩隆起區(qū).研究區(qū)物源變化是構(gòu)造、沉積環(huán)境在晚古新世發(fā)生劇變的結(jié)果,這種物源變化對該區(qū)的蓋層發(fā)育及對油氣層封蓋能力產(chǎn)生了較大影響.
[Abstract]:In order to deeply analyze the provenance of the Minyuefeng formation of the Upper Paleocene in Jiaojiang Sag, and to explore the research methods suitable for the sea area, the U-Pb dating data of rock components, heavy minerals and detrital zircons in the Jiaojiang sag of the East China Sea are comprehensively analyzed. The results show that the provenance of the upper and lower members of the Mingyuefeng formation in the eastern part of the sag has changed. The material source of the lower segment is mainly from the sea reef uplift in the eastern part of the sag, and the acidic intrusive rocks in the transitional arc-cutting arc environment are the main source. The main source rocks were 183N209Ma, with a small amount of metamorphic rocks and other Mesozoic igneous rocks, and during the deposition period of the upper member of the Mingyuefeng formation, the main provenances were acidic exhalation rocks and intrusive rocks in the transitional arc environment. The detrital zircon age is mainly at 106 ~ 116 Ma, which is basically the same as that of the surrounding area, and combined with the evolution analysis of sedimentary system, it is shown that the source of the whole Jiaojiang sag comes from the Zhejiang and Fujian uplift in the west of China. The change of provenance in the study area is a result of tectonic and depositional changes in the late Paleocene, which have a great influence on the development of the caprock and the sealing ability of the oil and gas reservoirs in the study area.
【作者單位】： 同濟大學(xué)海洋地質(zhì)國家重點實驗室;中海石油(中國)有限公司上海分公司;
【分類號】：P534.612;P618.13
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本文編號：2211338