本文選題：王坡頁巖 + 斑脫巖　； 參考：《地質(zhì)論評》2017年05期

【摘要】：陜西漢中梁山瓜德魯普統(tǒng)—樂平統(tǒng)界線(GLB)附近的吳家坪組底部王坡頁巖段長期以來被認為是古風(fēng)化殼沉積,代表了茅口期后暴露于地表風(fēng)化剝蝕的產(chǎn)物。最近對該地層進行了重新研究,采集了系列巖石和化石樣品,進行了X射線衍射、古生物學(xué)、巖相學(xué)和巖石學(xué)分析。X射線衍射分析表明該粘土層主要礦物成分為蒙脫石71%,片沸石23%,石英6%,暗示其物質(zhì)來源于火山玻璃。巖相學(xué)分析顯示巖石主要由蝕變礦物組成,具有蝕變殘留玻屑凝灰質(zhì)結(jié)構(gòu),其中蒙脫石、片沸石保留了原巖中的玻屑的塑性形態(tài)。粘土層中大量腕足動物化石暗示其為海相環(huán)境。研究結(jié)果表明王坡頁巖是典型的斑脫巖,并非風(fēng)化殼和長期剝蝕的產(chǎn)物,而是峨眉山大火成巖省火山噴發(fā)時火山灰在海相環(huán)境下沉積、蝕變的產(chǎn)物�；鹕交以谡\海沉積時對海洋生態(tài)系統(tǒng)造成嚴重破壞,導(dǎo)致了包括腕足動物在內(nèi)的海洋生物的生存危機。
[Abstract]:The Wangpo shale formation at the bottom of the Wujiaping formation near the Gelupin-Leping boundary line in Liangshan County Shaanxi Province has long been considered as a paleo-weathered crust deposit representing the product of surface weathering and denudation after the Maokou period. The strata have recently been restudied, a series of rock and fossil samples have been collected, X-ray diffraction, paleontology, X-ray diffraction analysis shows that the main mineral components of the clay layer are montmorillonite 71, zeolite 2310, quartz 6, suggesting that the material originates from volcanic glass. The petrographic analysis shows that the rock is mainly composed of altered minerals and has a residual glassy tuff structure in which montmorillonite and schist zeolite retain the plastic morphology of glassy debris in the original rock. A large number of brachiopod fossils in the clay layer indicate that they are marine environments. The results show that Wangpo shale is a typical porphyry, not the product of weathering crust and long-term denudation, but the product of volcanic ash deposition and alteration during volcanic eruption in Emeishan great igneous province. Volcanic ash caused serious damage to marine ecosystem when deposited in normal shallow water, resulting in the survival crisis of marine life, including brachiopods.
【作者單位】： 長安大學(xué)地球科學(xué)與資源學(xué)院國土資源部巖漿作用成礦與找礦重點實驗室;陜西省早期生命與環(huán)境重點實驗室(西北大學(xué));中國地質(zhì)大學(xué)長城學(xué)院地球科學(xué)與資源系;
【基金】：國家自然科學(xué)基金資助項目(編號:41472015) 中國國家留學(xué)基金管理委員會資助項目(編號:201306565037) 中央高�；究蒲袠I(yè)務(wù)費專項基金資助項目(編號:2013G3274021,2014G3272013)的成果~~
【分類號】：P534.46

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