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西藏班公湖地區(qū)竟柱山組時(shí)代及其構(gòu)造意義

發(fā)布時(shí)間:2018-06-10 15:19

  本文選題:竟柱山組 + 地質(zhì)特征��; 參考:《大地構(gòu)造與成礦學(xué)》2016年04期


【摘要】:上白堊統(tǒng)竟柱山組呈近EW向分布于班公湖 怒江縫合帶內(nèi),該組以陸相磨拉石建造為特征,角度不整合在蛇綠巖及老的海相地層之上,從早到晚由河流相向湖泊相演化。本文以班公湖 怒江縫合帶西段的班公湖地區(qū)出露的竟柱山組為主要研究對象,對其巖性特征、沉積環(huán)境及形成時(shí)代進(jìn)行了分析,認(rèn)為竟柱山組為班公湖 怒江特提斯洋全面閉合后的陸相山間盆地沉積,是洋陸轉(zhuǎn)換全面完成之后的陸相沉積。本文首次對班公湖地區(qū)竟柱山組進(jìn)行了ESR年代學(xué)、磁性地層學(xué)研究,得出了研究區(qū)竟柱山組底部礫巖的ESR年齡為92.0±9.0 Ma,古地磁測年顯示該組的底界年齡約為96 Ma。班公湖地區(qū)在96 Ma左右全面完成了由洋到陸的轉(zhuǎn)換,進(jìn)入了陸內(nèi)環(huán)境。
[Abstract]:The Upper Cretaceous Jingzhushan formation is distributed in the Nu River suture zone of Bangong Lake in the near EW direction. The formation is characterized by continental Molarasite formation, unconformable on ophiolite and the old marine strata, and evolves from river to lake facies from early to late. In this paper, the outcrop of Jingzhushan formation in the western section of the Bangong Lake Suture Zone of Bangong Lake is taken as the main research object. The lithologic characteristics, sedimentary environment and forming age of the formation are analyzed. It is considered that the Jingzhushan formation is the continental intermountain basin after the complete closure of the Tethys ocean in Bangong Lake and the continental facies after the completion of oceanic land conversion. In this paper, the ESR chronology and magnetic stratigraphy of the Jingzhushan formation in Bangong Lake area have been studied for the first time. The ESR age of the bottom conglomerate of the Jingzhushan formation is 92.0 鹵9.0 Ma, and the paleomagnetic dating shows that the bottom boundary age of the formation is about 96 Ma. The Bangong Lake area completed the transition from ocean to land at about 96 Ma and entered the intracontinental environment.
【作者單位】: 中國地質(zhì)大學(xué)(武漢)緊缺礦產(chǎn)資源勘查協(xié)同創(chuàng)新中心;中國地質(zhì)大學(xué)(武漢)資源學(xué)院;中陜核工業(yè)集團(tuán)公司;中國地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心;
【基金】:中國地質(zhì)調(diào)查局1:50000區(qū)域地質(zhì)調(diào)查項(xiàng)目(1212011121242、1212011121246);中國地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心地調(diào)科研項(xiàng)目委托業(yè)務(wù)(121201010000150014-28、121201010000150014-29)聯(lián)合資助
【分類號】:P535;P542

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