【摘要】：大渡河金成礦帶基性巖脈分布廣泛,在大渡河金成礦帶內(nèi)各金礦床都有出現(xiàn),且空間走向也存在一定的差異。近年來,很多學者、專家對該處基性巖脈與金成礦的關系提出了很多觀點,有人認為這些基性巖脈與大渡河金成礦帶上金的成礦有密切的關系,也有人認為二者之間并沒有直接的關系。前者認為大渡河金成礦帶各金礦床都有基性巖脈出現(xiàn)且多與含礦石英脈呈侵入接觸關系,后者認為前者并沒有直接的證據(jù)說明該區(qū)基性巖脈的形成期次與該區(qū)金礦形成的構造期次相同,對其在成因上的關系并沒有系統(tǒng)的研究。針對該問題,筆者在導師的指導下,通過對大渡河流域基性巖脈在不同時代、不同基性巖帶兩方面進行詳細研究對比,得出以下認識:1.大渡河金成礦帶內(nèi)基性巖脈成巖年代主要分為三個時期:印支期(212Ma~224Ma)、加里東期(425Ma~435Ma)、晉寧期(731Ma~754Ma),其中晉寧期基性巖脈主要分布于基底雜巖中,加里東期、印支期基性巖脈分布較廣,在基底雜巖和沉積蓋層中都有出露。大渡河金成礦帶內(nèi)含礦石英的ESR測年表明其形成于喜山期(陳穎,2015)。綜合大渡河金成礦帶內(nèi)基性巖脈與含礦石英的巖石學特征及年代學分析,目前看來,大渡河金成礦帶內(nèi)基性巖的形成時代要早于其中金礦。2.大渡河金成礦帶內(nèi)3個時期的基性巖脈形成于火山島弧環(huán)境、堿性洋中脊環(huán)境和板內(nèi)拉張環(huán)境;據(jù)所測得的研究區(qū)基性巖脈樣品的微量元素數(shù)據(jù)顯示,Zr/Y比值、Zr/Nb比值均小于18,因此該區(qū)基性巖脈的成巖物質(zhì)來源于富集地幔。3.從地質(zhì)特征上可以看出研究區(qū)基性巖脈都發(fā)生了較強的蝕變作用,都具殘余變晶結構的特點,同時都受到了后期硅質(zhì)熱液流體的侵蝕作用。
[Abstract]:The basic rock veins in the Daduhe gold metallogenic belt are widely distributed, and all the gold deposits appear in the Daduhe gold metallogenic belt, and there are some differences in the spatial strike. In recent years, many scholars and experts have put forward a lot of views on the relationship between the basic vein and gold mineralization. Some people think that these basic rock veins are closely related to the mineralization of gold in the Dadu River gold metallogenic belt. Others argue that there is no direct relationship between the two. The former holds that the gold deposits in the Daduhe gold metallogenic belt have basic rock veins and have intrusive contact with ore-bearing veins. The latter holds that the former has no direct evidence to show that the formation stage of the basic vein in this area is the same as that of the gold deposit in this area, and there is no systematic study on the relationship between the origin of the basic vein and the tectonic stage of the gold deposit in this area. Aiming at this problem, the author, under the guidance of his tutor, makes a detailed study and comparison of the basic rock veins of the Dadu River Basin in different times and different basic rock belts, and obtains the following understanding: 1. The diagenetic age of the basic vein in the Daduhe gold metallogenic belt is divided into three periods: Indosinian (212Ma~224Ma), Caledonian (425Ma~435Ma), Jinning (731Ma~754Ma), in which the Jinning basic-vein is mainly distributed in the basement complex, and the Caledonian and Indosinian basic-vein are widely distributed. Both the basement complex and the sedimentary caprock are exposed. The ESR dating of ore-bearing elements in the Daduhe gold metallogenic belt indicates that it was formed in the Xishan period (Chen Ying 2015). Based on the petrological characteristics and geochronological analysis of the basic veins and ore-bearing rocks in the Daduhe gold metallogenic belt, it appears that the age of formation of the basic rocks in the Daduhe gold metallogenic belt is earlier than that of the gold ore. The basic veins of the three periods in the Daduhe gold metallogenic belt were formed in the volcanic island arc environment, the alkaline mid-oceanic ridge environment and the intraplate extensional environment. The trace element data of the basic vein samples in the study area show that the ratio of Zr / Y and Zr / NB are all less than 18, so the diagenetic material of the basic vein in this area is derived from the enriched mantle. From the geological characteristics, it can be seen that all the basic veins in the study area have undergone strong alteration, all have the characteristics of residual amorphous structure and have been eroded by siliceous hydrothermal fluids in the late stage of the study area.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.51

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