本文選題：片麻巖穹隆 + 花崗片麻巖��； 參考：《地球學報》2017年05期

【摘要】：錯那洞片麻巖穹隆位于特提斯喜馬拉雅南側,靠近藏南拆離系,是北喜馬拉雅片麻巖穹隆帶(NHGD)中最新發(fā)現(xiàn)的新成員。本文在詳實的野外地質(zhì)調(diào)查基礎上,首次全面介紹了錯那洞片麻巖穹隆的結構組成,同時進行了片麻巖的年代學研究。結果表明,錯那洞片麻巖穹隆由核-幔-邊三部分組成,核部由花崗片麻巖及淡色花崗巖組成,并可見大量偉晶巖脈穿插;幔部為一套強變質(zhì)變形的二云母片巖,從內(nèi)至外具有夕線石+石榴石→藍晶石+石榴石→十字石+石榴石→石榴石+十字石+堇青石→堇青石+石榴石的變質(zhì)分帶特征;邊部主要為淺變質(zhì)沉積巖系,可見較多因穹隆隆升而形成的A型褶皺�；◢徠閹rLA-ICP-MS鋯石U-Pb年齡為(499.7±3.4)Ma(MSWD=0.025),與NHGD其它穹隆核部片麻巖時代基本一致,均為泛非—早古生代造山活動的產(chǎn)物。在本次野外地質(zhì)調(diào)查過程中,在錯那洞片麻巖穹隆中發(fā)現(xiàn)了矽卡巖型鎢錫鈹工業(yè)礦體以及銅金礦化體,同時在偉晶巖中還存在著大量的綠柱石等寶石礦產(chǎn),這樣的成礦作用與礦化組合在NHGD中尚屬首次發(fā)現(xiàn),基于此本文提出了北喜馬拉雅片麻巖穹隆控礦新命題。
[Abstract]:The Dinaodong gneiss dome, located in the south of Tethys Himalaya, is a newly discovered member of the Northern Himalayan Gneiss Dome (NHGD). On the basis of detailed field geological survey, the structural composition of the dome of the gneiss in Dina cave is introduced for the first time, and the geochronology of the gneiss is also studied. The results show that the dome is composed of three parts: core, mantle and edge, the core is composed of granitic gneiss and pale granite, and a large number of pegmatite veins can be seen in the dome, and the mantle is a set of strongly metamorphic dimica schist. It has the metamorphic zonation characteristics from the inside to the outside of the sillimanite garnet, cordierite, and cordierite garnet. It can be seen that more A-type folds formed by dome uplift. The LA-ICP-MS zircon U-Pb age of the granitic gneiss is 499.7 鹵3.4 Ma-MSWDU 0.025, which is basically consistent with the gneiss age of the other dome of NHGD, and is the product of the Pan-African early Paleozoic orogenic activity. In the course of this field geological survey, skarn type tungsten, tin, beryllium industrial ore bodies and copper-gold mineralization bodies were found in the dome of the gneiss in Dhonaodong, and there are also a large number of gemstone minerals such as Beryl in pegmatite. This combination of mineralization and mineralization is first discovered in NHGD. Based on this, a new proposition of controlling ore deposits in the dome of the northern Himalayan gneiss is proposed.
【作者單位】： 中國地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心;
【基金】：國家重點研發(fā)計劃深地資源開采項目(編號:2016YFC0600308) 中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項目(編號:DD20160015)聯(lián)合資助~~
【分類號】：P588.345;P612

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本文編號：1924024