本文關(guān)鍵詞： 大渡河 基性-超基性巖脈 形成時(shí)代 成因　出處：《成都理工大學(xué)》2016年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：大渡河金成礦帶位于揚(yáng)子地臺(tái)西緣,康定大渡河兩岸。在大地構(gòu)造位置上位于松潘-甘孜造山帶與川滇南北向構(gòu)造帶及西南三江造山帶的過(guò)渡地帶。大渡河金成礦帶的基性—超基性脈巖主要是輝綠巖,這些輝綠脈巖在大渡河金成礦帶中多個(gè)典型金礦床均發(fā)現(xiàn)出露(包括黃金坪、韭菜坪、白金臺(tái)子、一柱香、二里溝、康定金礦等)。并且輝綠巖在空間分布上存在密切關(guān)系。論文以大渡河金成礦帶基性-超基性巖脈形成時(shí)代與成因探討為重點(diǎn),通過(guò)礦床地質(zhì)特征、地球化學(xué)特征、成礦時(shí)代、巖脈年代學(xué)以及前人的一些研究成果分析對(duì)比等方面研究對(duì)大渡河流域多個(gè)典型金礦中采集的輝綠巖進(jìn)行探討,通過(guò)研究得出以下認(rèn)識(shí)：(1)大渡河金成礦帶在經(jīng)歷了前震旦紀(jì)基底形成階段,震旦紀(jì)到中三疊世時(shí)期內(nèi),被動(dòng)大陸邊緣從起始到發(fā)展,晚三疊世-白堊紀(jì)碰撞造山階段和新生代陸內(nèi)造山階段。這些有利的地質(zhì)構(gòu)造運(yùn)動(dòng)為研究區(qū)域內(nèi)的巖漿活動(dòng)提供了有利的動(dòng)力來(lái)源,物質(zhì)來(lái)源以及運(yùn)移通道。根據(jù)鋯石U-Pb測(cè)試數(shù)據(jù),得出大渡河金成礦帶基性-超基性巖脈可以分為三個(gè)期次,第一期為754Ma,如姑咱-長(zhǎng)河壩輝綠巖脈；第二期為430Ma,如偏巖子輝綠巖脈；第三期為220Ma,如二里溝、一柱香輝綠巖脈。三個(gè)期次基性-超基性巖脈具有一定的分布規(guī)律,即在基底中出露的基性-超基性巖脈除白金臺(tái)子和極少數(shù)形成較早的基性巖脈外均在220Ma左右形成,而在蓋層中的基性-超基性巖脈形成時(shí)代均為430Ma左右。(2)由于大渡河金成礦帶構(gòu)造環(huán)境的復(fù)雜性和多期性,促成該地區(qū)巖漿活動(dòng)較為活躍,根據(jù)對(duì)該地區(qū)的基性-超基性巖脈巖石化學(xué)性質(zhì)的差異的分析可以將三個(gè)期次的基性-超基性巖脈劃分為兩種成因類(lèi)型,第一種屬于島弧火山環(huán)境下形成的基性巖脈,其形成時(shí)期大都在220Ma,其動(dòng)力來(lái)源于板塊間的俯沖碰撞,物質(zhì)來(lái)源于俯沖板片脫水交代地幔熔融通過(guò)由于板塊俯沖形成的斷裂帶上涌形成,這類(lèi)基性巖脈絕大多數(shù)存在于基底地層中。第二種成因機(jī)制類(lèi)似于MORB,是板內(nèi)裂谷拉張所形成的,這一組基性巖脈年齡在430Ma左右,其物質(zhì)來(lái)源于軟流圈地幔,通過(guò)拉張環(huán)境形成的斷裂上涌熔融形成,這類(lèi)基性巖脈出露于蓋層地層中。(3)大渡河基性-超基性巖脈的巖石化學(xué)特征表明,這些基性-超基性巖脈的物質(zhì)來(lái)源于深部地殼或上地幔,基性巖脈的出現(xiàn)指示了其所在位置曾發(fā)生過(guò)深達(dá)下地殼或上地幔的拉張作用,說(shuō)明大渡河斷裂是深達(dá)下地殼或上地幔的深大斷裂。在區(qū)域性拉張的環(huán)境下,不僅有利于深部地殼或上地幔的基性-超基性巖漿侵入,同樣有利于深部熱液流體運(yùn)移。同樣,前人研究表明金元素在淺部地殼的初始豐度非常低,地殼中的金絕大部分來(lái)源于深部地殼或上地幔。在野外地質(zhì)調(diào)查中發(fā)現(xiàn),該地區(qū)多數(shù)金礦床/體同基性-超基性巖脈在空間上存在著密切的關(guān)系,根據(jù)項(xiàng)目組所測(cè)得的大渡河金成礦帶上的金礦床/體的年齡在5～50Ma范圍內(nèi),遠(yuǎn)遲于該地區(qū)基性-超基性巖脈的形成時(shí)代,所以形成金礦的含金熱液流體可能是沿用了基性-超基性巖漿運(yùn)移通道。
[Abstract]:The Dadu River gold metallogenic belt is located in the western margin of the Yangtze platform, Kangding Dadu River. The tectonic position is located in Sichuan and Yunnan north-south tectonic zone and transition zone of southwestern Sanjiang orogenic belt of Songpan - Ganzi orogenic belt. The Dadu River metallogenic belt of mafic - ultramafic dikes are mainly diabase, the diabase dikes in the Dadu River gold metallogenic belt of several typical gold deposits were found in the exposed (including Huangjinping, Jiucaiping, platinum table, incense, gold and so on. The second gully, Kangding) and diabase has close relationship in spatial distribution. Based on the Dadu River metallogenic belt of mafic ultramafic dikes formed age and Genesis of the focus, through the geological characteristics, geochemical characteristics, metallogenic epoch, the acquisition of several typical gold deposits in the Dadu River Valley of diabase dikes on geochronology and some previous research results of comparative analysis etc. To know through the research as follows: (1) the Dadu River gold metallogenic belt experienced in the pre Sinian basement formation stage, the Sinian to Triassic in the three period, from the beginning to the development of the passive continental margin, three of Late Triassic Cretaceous orogenic stage and Cenozoic intracontinental orogenic stage. These favorable tectonic movement provides a source of power for the study area of magmatic activities, material source and migration channel. According to the zircon U-Pb test data, the Dadu River metallogenic belt of basic ultrabasic veins can be divided into three stages the first stage is 754Ma, such as guzan - Changheba diabase; second for a period of 430Ma, such as pianyanzi diabase; the third period is 220Ma, such as the two groove diabase. Incense, a three stage sub ultrabasic rock veins have a certain distribution, namely basic and ultrabasic rocks exposed in the basement in platinum veins The table and a handful of forming mafic dikes earlier formed were about 220Ma, while in the cover layer in the mafic ultramafic dikes formed are about 430Ma. (2) because of the complexity of the tectonic environment of the Dadu River gold metallogenic belt and multi period, contributed to the magmatic activity in this area is more active, according to the analysis the difference of rock chemical properties of mafic ultramafic dikes of the area can be three times the basic ultrabasic veins are divided into two types, the first formation belongs to the island arc volcano under the environment of the formation of mafic dikes, mostly in the period of 220Ma, its power comes from the subduction and collision of the plates that material from the subduction melting of the metasomatized mantle through subduction due to fracture zone formed by upwelling formation, these mafic dikes exists in the vast majority of the basement strata. Second kinds of genetic mechanism similar to MORB, is the intraplate pull A form, this group of mafic dikes at the age of about 430Ma, the substances derived from the asthenospheric mantle, formed by fracture extensional environment formed by upwelling melting, the mafic dykes outcropped in the covering strata. (3) showed that the geochemical characteristics of mafic ultramafic rocks in the Dadu River dikes and these basic ultrabasic veins material from deep crust or upper mantle, appear mafic dikes indicate that their position had a depth of the lower crust or upper mantle tension, indicating the Dadu River fault is a deep fault depth of the lower crust or upper mantle. In regional extensional environment next, not only the base for deep crust or upper mantle ultrabasic magmatic intrusion, also conducive to the deep hydrothermal fluid migration. Also, previous studies show that the gold element in the initial abundance of shallow crust is very low, the crust of the gold from the vast majority of deep Crust or upper mantle. Found in field geological survey, the majority of gold deposits in the area / body have the same basic ultrabasic veins in space are closely related, according to the gold mineralization of Dadu River measured project group with the gold deposit / body age in the range of 5 ~ 50Ma, far late in the area of mafic ultramafic dikes formed the era, so the formation of gold bearing hydrothermal fluid may be used for basic ultrabasic magma transportation channel.

【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：P618.51;P588.12

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