本文選題：張廣才嶺 + 晚古生代　； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：張廣才嶺位于黑龍江省中部。東部以牡丹江斷裂為界與佳木斯地塊相鄰；西部以遜克-鐵力斷裂為界與松遼盆地相鄰；南部延伸到吉林省舒蘭市附近；北部穿過黑龍江一直延伸到俄羅斯境內(nèi)。它是早古生代小興安嶺－松嫩地塊與佳木斯地塊之間的碰撞造山帶，在晚古生代成為海西活動(dòng)大陸邊緣的一部分。 張廣才嶺地區(qū)顯生宙花崗巖廣泛出露，被稱之為“巨型花崗巖省”。該區(qū)花崗巖在20世紀(jì)70年代及以前的區(qū)域地質(zhì)調(diào)查中，，由于多數(shù)巖體侵入晚古生代地層并與侏羅紀(jì)地層呈沉積接觸關(guān)系，所以前人將該區(qū)花崗巖中的絕大部分確定為海西期花崗巖。但隨著同位素測(cè)年技術(shù)的發(fā)展，人們通過Rb-Sr、K-Ar等測(cè)年方法發(fā)現(xiàn),原本被定為海西期的花崗巖年齡均在印支期（250~222Ma）范圍內(nèi)，因此人們將原來的海西期花崗巖確定為印支期。近年來，隨著LA-ICP-MS和SHRIMP等測(cè)年技術(shù)的發(fā)展，人們?cè)诖_定該地區(qū)大部分花崗巖的形成年代為印支期的同時(shí)，也發(fā)現(xiàn)了早古生代花崗巖和海西期花崗巖的存在。 根據(jù)前人研究成果，該地區(qū)海西期花崗巖大部分屬于I型花崗巖，而本文在依托“錫霍特成礦帶內(nèi)生礦產(chǎn)成礦模式和成礦系列境內(nèi)外對(duì)比研究”課題對(duì)該地區(qū)進(jìn)行研究的過程中，卻發(fā)現(xiàn)了海西期A型花崗巖的存在。 這些花崗巖體的巖性主要為黑云母二長(zhǎng)花崗巖和正長(zhǎng)花崗巖。它們的SiO2含量為66.03%~77.20%，K2O+Na2O的含量為7.75%~9.94%，屬于堿性系列；A/CNK值為0.91~1.15，A/NK值為0.98~1.51，為準(zhǔn)鋁質(zhì)到弱過鋁質(zhì)巖石；稀土元素均顯示出了明顯的的負(fù)銪異常，微量元素表現(xiàn)出Ba、Sr、P、Ti等元素的明顯虧損。本文中這些準(zhǔn)鋁質(zhì)到弱過鋁質(zhì)的堿性A型花崗巖年齡主要集中在260Ma和300Ma，屬于晚古生代的晚石炭世末期到二疊紀(jì)晚期。 本文通過Maniar、Pearce和Barbarin三種花崗巖構(gòu)造環(huán)境判別方法，并結(jié)合該地區(qū)的大地構(gòu)造背景，得出這些A型花崗巖的形成應(yīng)該與古亞洲洋向佳木斯地塊俯沖過程中產(chǎn)生的弧后裂陷有關(guān)。
[Abstract]:Zhang Guangcailing is located in the middle of Heilongjiang Province. In the east, the Mudanjiang fault is the boundary of Jiamusi block; in the west, the Xunke-Taili fault is adjacent to the Songliao basin; in the south, it extends near Shulan City, Jilin Province; and in the north, it extends through Heilongjiang to Russia. It is a collisional orogenic belt between the Xiaoxinganling-Songnen block and the Jiamusi block in the early Paleozoic and became a part of the Hercynian active continental margin in the late Paleozoic. Zhang Guang Ciling area Phanerozoic granite widely exposed, known as "giant granite province." In the regional geological survey of the granite in the 1970s and before, most of the granites intruded into the late Paleozoic strata and were in contact with the Jurassic strata. Therefore, most of the granites in this area are determined to be Hercynian granites. However, with the development of isotopic dating techniques, it is found by Rb-SrnK-Ar dating method that the original Hercynian granite ages are within the range of the Indosinian period (250 ~ 222Ma), so the original Hercynian granites are defined as the Indosinian epoch. In recent years, with the development of LA-ICP-MS and shrimp dating techniques, the early Paleozoic and Hercynian granitic granites were found in this area, while the formation age of most granites in the area was determined to be the Indosinian epoch. According to previous studies, most of the Hercynian granites in this area belong to I-type granites. In the course of studying this area based on the subject of "metallogenic model of endogenetic minerals and comparative study of metallogenic series at home and abroad" in the Siholt metallogenic belt, the existence of A-type granites in Hercynian period was found in this paper. The lithology of these granite bodies is mainly biotite monzogranite and syenite granite. Their Sio _ 2 content is 66.03 and the content of K _ 2O and Na _ 2O is 7.75 and 9.94, which belongs to the alkaline series A / C _ (K) = 0.91 ~ 1.15% A / N = 0.98 ~ 1.51, quasi aluminous to weakly peraluminous rocks, and the rare earth elements show obvious negative europium anomaly, and the trace elements show obvious depletion of Bao-Sr-PnTi and so on. In this paper, the ages of these quasi-aluminous to weakly peraluminous alkaline A-type granites are mainly concentrated at 260 Ma and 300 Ma, belonging to late Paleozoic late Carboniferous to late Permian. In this paper, by means of three tectonic environments of Maniarine Pearce and Barbarin, and combining with the tectonic setting of this area, it is concluded that the formation of these A-type granites is related to the back-arc rift produced during the subduction of the paleo-Asian oceanic Jiamusi block.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P588.121;P597.3

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