本文選題：松潘-甘孜造山帶 + 里伍群��； 參考：《地質(zhì)學(xué)報》2017年09期

【摘要】：川西江浪穹隆在大地構(gòu)造上位于松潘-甘孜造山帶東南緣。環(huán)穹窿腰部分布著一系列產(chǎn)狀、礦床特征相似的銅多金屬礦床——里伍式銅礦床,包括里伍、中咀、筍葉林、柏香林、挖金鉤、黑牛洞等礦床。這些礦床的礦體主要呈似層狀產(chǎn)出于中元古代里伍群中,其成因模式目前尚不明確。本研究選擇里伍和黑牛洞銅礦中的含礦石英-電氣石脈作為重點研究對象,對其中的代表性電氣石單礦物進行了電子探針分析及LA-MC-ICPMS原位硼同位素測試,據(jù)此制約礦床的成礦物質(zhì)來源。背散射及顯微圖像特征揭示兩礦床的含礦電氣石具有單一的流體來源;電子探針分析結(jié)果表明這些電氣石在類型上均屬鎂電氣石;硼同位素測試結(jié)果顯示兩礦床的電氣石δ11 B值分別為-15.47‰±0.83‰~-13.06‰±0.77‰(n=10)及-13.19‰±0.57‰~-5.91‰±0.67‰(n=16),與花崗巖的δ11B值區(qū)間非常一致,表明這兩個礦床屬(區(qū)內(nèi)燕山期)巖漿期后熱液礦床。通過對比研究,本文進一步提出在松潘-甘孜造山帶內(nèi)很可能存在一條NE-SW向的銅多金屬成礦帶,即松潘-甘孜銅多金屬構(gòu)造成礦帶。本次研究不僅可以豐富層狀型礦床成礦理論,而且對指導(dǎo)該造山帶中其他穹窿體的找礦具有較為重要的實際意義。
[Abstract]:The Jianglang dome in western Sichuan is located in the southeast margin of Songpan-Ganzi orogenic belt. At the waist of the ring dome, there are a series of copper-polymetallic deposits with similar characteristics, such as Liwu, Zhongzui, bamboo shoot Ye Lin, cypress, gold-gouging, HeiNiudong and so on. The ore bodies of these deposits are mainly stratiform occurring in the Middle Proterozoic Liwu Group, and its genetic model is unclear. In this study, the ore-bearing tourmaline veins in Liwu and Heiniodong copper mines were selected as the main research objects, and the typical tourmaline monoliths were analyzed by electron probe and in situ boron isotopic measurements by LA-MC-ICPMS. Therefore, the source of ore-forming material is restricted. The characteristics of backscattering and microscopic images reveal that the mineralized tourmalines of the two deposits have a single fluid source, and the results of electron probe analysis show that these tourmalines are of magnesium tourmaline type. The results of boron isotope test show that the 未 11B values of tourmaline in the two deposits are -15.47 鹵0.83 鈥，

本文編號：2028211