發(fā)布時(shí)間：2018-06-29 23:33

  本文選題：硅質(zhì)巖 + 海盆��； 參考：《現(xiàn)代地質(zhì)》2017年04期

【摘要】：為探討下?lián)P子地區(qū)二疊系硅質(zhì)巖的硅質(zhì)來源和形成背景,以巢湖地區(qū)二疊紀(jì)棲霞組和孤峰組硅質(zhì)巖為研究對象,收集了前人大量有關(guān)棲霞組和孤峰組的研究成果和數(shù)據(jù),并對采自棲霞組和孤峰組硅質(zhì)巖樣品進(jìn)行了主量元素、微量元素、稀土元素測試。棲霞組、孤峰組硅質(zhì)巖樣品測試結(jié)果顯示,硅質(zhì)巖的稀土元素經(jīng)北美頁巖標(biāo)準(zhǔn)化后的配分曲線近似平坦型向左傾斜,有弱Ce負(fù)異常,且HREE弱富集,反映了熱水沉積硅質(zhì)巖的特征。研究區(qū)硅質(zhì)巖樣品的Al-FeMn三角圖中,樣品投點(diǎn)分布較廣,即Al比值變化范圍較大,認(rèn)為是巖漿在噴發(fā)過程中受硅-鋁質(zhì)陸殼混染作用的結(jié)果。結(jié)合沉積環(huán)境判別指標(biāo)分析認(rèn)為:棲霞組硅質(zhì)巖沉積時(shí)期其沉積環(huán)境主要為大陸邊緣環(huán)境;孤峰組硅質(zhì)巖沉積時(shí)期其沉積環(huán)境為大陸邊緣-海盆過渡環(huán)境。從棲霞組到孤峰組沉積時(shí)期,海侵規(guī)模不斷變大,水體變深,海盆面積擴(kuò)大,研究區(qū)在不同時(shí)期沉積環(huán)境存在差異。研究區(qū)棲霞組、孤峰組硅質(zhì)巖的沉積與大陸邊緣裂陷活動緊密相關(guān)。
[Abstract]:In order to study the origin and formation background of the siliceous rocks of the Permian in Lower Yangtze area, taking the Qixia formation and the Gufeng formation of the Permian in Chaohu area as the research objects, a great deal of research results and data of Qixia formation and Gufeng formation have been collected. The main elements, trace elements and rare earth elements of siliceous rock samples collected from Qixia formation and Gufeng formation were tested. The samples of siliceous rocks from Qixia formation and Gufeng formation show that the rare earth elements of siliceous rocks are approximately flat and inclined to the left through the normalized distribution curve of North American shale, with weak ce negative anomalies and weak HREE enrichment. It reflects the characteristics of hydrothermal sedimentary siliceous rocks. In the Al-FeMn triangle diagram of siliceous rock samples in the study area, the distribution of the sample input points is relatively wide, that is, the Al ratio varies in a large range, which is considered to be the result of the magma being mixed by silicon-aluminite continental crust during the eruption process. Based on the discriminant analysis of sedimentary environment, it is concluded that the sedimentary environment of siliceous rocks in Qixia formation is mainly continental margin environment, and that of siliceous rock in Gufeng formation is the transitional environment between continental margin and oceanic basin during the sedimentary period of Gufeng formation. From Qixia formation to Gufeng formation, the scale of transgression becomes larger, the water body deepens, and the basin area expands. The sedimentary environment of the study area is different in different periods. The deposition of siliceous rocks in Qixia formation and Gufeng formation in the study area is closely related to the continental margin rifting activity.
【作者單位】： 中國石油大學(xué)(華東)地球科學(xué)與技術(shù)學(xué)院;中國有色金屬工業(yè)昆明勘察設(shè)計(jì)研究院有限公司;
【基金】：國家自然科學(xué)基金項(xiàng)目(41272123) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(13CX06016A)
【分類號】：P548;P588.244

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本文編號：2083849