發(fā)布時(shí)間：2018-04-28 06:52

  本文選題：興凱地塊南部 + 鋯石U-Pb測(cè)年　； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：興凱地塊大部分位于俄羅斯境內(nèi)，西北部以敦-密斷裂為界與佳木斯地塊相鄰，北部與那丹哈達(dá)-比金地體相接（邵濟(jì)安，1995），處于古亞洲洋構(gòu)造域和古太平洋構(gòu)造域的疊加部位，構(gòu)造演化十分復(fù)雜。興凱地塊經(jīng)歷了與松嫩-張廣才嶺地塊拼合、西太平洋俯沖和敦密斷裂左行走滑等一系列構(gòu)造演化，因此興凱地塊南部為研究東北地區(qū)區(qū)域構(gòu)造演化提供了一個(gè)很好的窗口。興凱地塊南部有較大面積的花崗巖出露，黑龍江地質(zhì)局（1993）通過地質(zhì)接觸關(guān)系將其劃分為印支期并統(tǒng)歸到東帶花崗巖，但缺乏精確的同位素測(cè)年數(shù)據(jù)支持，同時(shí)，有關(guān)這些花崗巖形成的成因和形成時(shí)的構(gòu)造背景等還沒有系統(tǒng)的研究資料。 本文選取了興凱地塊南部八楞山巖體、金場(chǎng)溝巖體、天嶺橋巖體及風(fēng)月橋林場(chǎng)巖體進(jìn)行了巖石學(xué)、年代學(xué)、地球化學(xué)及鋯石Hf同位素研究。這些花崗巖主要為二長(zhǎng)花崗巖，部分為花崗閃長(zhǎng)巖。鋯石LA-ICPMS U-Pb測(cè)年結(jié)果顯示，巖性為二長(zhǎng)花崗巖的八楞山巖體形成時(shí)代為204±2Ma、金場(chǎng)溝巖體形成時(shí)代為203±2Ma、天嶺橋巖體形成時(shí)代為205±2.4Ma；巖性為花崗閃長(zhǎng)巖的風(fēng)月橋林場(chǎng)巖體形成時(shí)代分別為202±2.5Ma。整體來看，興凱地塊南部花崗巖形成時(shí)代非常接近，由于國際地層表將201.3Ma作為三疊紀(jì)和侏羅紀(jì)的界限及測(cè)年的誤差因素，本文將其劃分為晚三疊世末期-早侏羅世初期。 上述花崗巖地球化學(xué)成分上比較富硅，SiO2含量在69.61%~77.27%，其中花崗閃長(zhǎng)巖的SiO2含量69.61%~69.98%，二長(zhǎng)花崗巖SiO2含量為74.24%~77.27%；弱過鋁質(zhì)，鋁飽和指數(shù)A/CNK在1~1.1之間；二長(zhǎng)花崗巖富鉀，K2O/Na2O=1.08~1.33，堿含量為w(K2O)+w（Na2O）=8.02%~8.39%，花崗閃長(zhǎng)巖相對(duì)富鈉，K2O/Na2O=0.58~0.65，堿含量為w(K2O)+w（Na2O）=6.71%~7.83%；二者稀土元素總量差異較大，輕稀土元素較為富集，虧損重稀土元素；富集大離子親石元素Rb、Th、U、K等，虧損高場(chǎng)強(qiáng)元素Sr、P、Ti等，二長(zhǎng)花崗巖有中等至較強(qiáng)的銪負(fù)異常（δEu=0.19~0.43），花崗閃長(zhǎng)巖的銪負(fù)異常則中等偏弱（δEu=0.57~0.82）。綜上，興凱地塊南部花崗巖均具有富硅、較富鋁，為弱過鋁質(zhì)的特征，二長(zhǎng)花崗巖為高鉀鈣堿性高分異I型花崗巖，，花崗閃長(zhǎng)巖為鈣堿性I型花崗巖。 興凱地塊南部花崗巖鋯石Hf同位素?cái)?shù)據(jù)顯示：二長(zhǎng)花崗巖和花崗閃長(zhǎng)巖的εHf（t）均為正值，為4.39~9.32，二階段Hf模式年齡比較年輕，為新元古代（0.65~0.96Ga）。結(jié)合巖石主量、微量元素特征、區(qū)域大地構(gòu)造演化等方面的研究，認(rèn)為花崗巖漿來源于太平洋板塊向西俯沖背景下新元古代地殼的部分熔融。
[Abstract]:The Xingkai block is mostly located in Russia, bordering the Jiamusi block on the northwestern side of the Dundon-Mi fault, and connecting the northern part with the Nathanhada-Bir gold terrane (Shao Ji'an Jian-1995), which is located in the superimposed part of the paleo-Asian ocean tectonic domain and the paleo-Pacific tectonic domain. The tectonic evolution is very complicated. The Xingkai massif has undergone a series of tectonic evolution, such as the combination with the Songne-Zhangguangcailing block, the subduction of the western Pacific Ocean and the left strike-slip of the Dumi fault. Therefore, the southern part of the Xingkai block provides a good window for the study of the regional tectonic evolution in the northeast region. There is a large area of granite outcrop in the south of the Xingkai block, which was divided into Indosinian and classified to the east by geological contact relationship, but it lacks accurate isotopic dating data. At the same time, There is no systematic study on the genesis and tectonic setting of these granites. In this paper, the Palangangshanite, Jinchanggou, Tianlingqiao and Fengyuqiao Linchang in the southern Xingkai block are selected for petrology, geochronology, geochemistry and zircon HF isotopic studies. These granites are mainly two-feldspar granodiorite and part granodiorite. The zircon LA-ICPMS U-Pb dating results show that the age of formation of the Palangshan, Jinchanggou, Tianlingqiao, Tianlingqiao and Fengyunqiao stands is 204 鹵2Ma, 203 鹵2Maand 205 鹵2.4Marespectively, and that of Fengyunqiao Linchang with granodiorite is 202 鹵2.5Ma. On the whole, the formation age of granites in the southern Xingkai block is very close. Because the international stratigraphic table regards 201.3Ma as the boundary of Triassic and Jurassic and the error factor of dating, this paper divides it into late Triassic and early Jurassic. The SiO2 content of granodiorite is 69.611.The SiO2 content of monzogranite is 77.270.The content of SiO2 in granodiorite is 69.61and the content of SiO2 is 77.270.The content of SiO2 is weak peraluminous, and the A/CNK of aluminite is between 11.1. The content of K _ 2O / Na _ 2O is 1.33 and the alkali content is 8.022 ~ 8.39. The granodiorite is relatively rich in sodium K _ 2O / Na _ 2O _ (0.58) 0.65, and the alkali content is w _ (K _ 2O) _ (6.71) ~ (7.83); the total amount of rare earth elements is quite different, the light rare earth element is more enriched, and the heavy rare earth element is depleted; the large ion lithophile element RbTH _ (+) K is enriched. The EU negative anomaly (未 EU _ (0.19) ~ (0.43) in the monzogranite is moderate to stronger than that in the granodiorite (未 EU _ (0.57) 0.82 ~ (2) ~ (-1), and the EU negative anomaly in the granodiorite is moderately weak (未 EU _ (0.57) ~ (0.82). All the granites in the southern Xingkai block are silicon-rich and aluminum-rich, characterized by weak peraluminite. The monzogranites are characterized by high potassium calc-alkaline and high-grade iso-I-type granodiorite, and granodiorite is calc-alkaline I-type granodiorite. The zircon HF isotopic data of granites in the southern Xingkai block show that the 蔚 Hftt of both the monzogranite and granodiorite are positive at 4.390.32, and the age of the two-stage HF model is relatively young, which is the Neoproterozoic age of 0.65U 0.96Gaan. Based on the study of rock principal quantity, trace element characteristics and regional tectonic evolution, it is considered that the magma originated from partial melting of the Neoproterozoic crust in the westward subduction of the Pacific plate.
【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

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 孫德有,吳福元,張艷斌,高山;西拉木倫河-長(zhǎng)春-延吉板塊縫合帶的最后閉合時(shí)間——來自吉林大玉山花崗巖體的證據(jù)[J];吉林大學(xué)學(xué)報(bào)(地球科學(xué)版);2004年02期

2 黃映聰;任東輝;張興洲;熊小松;張春艷;王躍;趙亮亮;;黑龍江省東部樺南隆起美作花崗巖的鋯石U-Pb定年及其地質(zhì)意義[J];吉林大學(xué)學(xué)報(bào)(地球科學(xué)版);2008年04期

3 孫曉猛;劉永江;孫慶春;韓國卿;王書琴;王英德;;敦密斷裂帶走滑運(yùn)動(dòng)的~(40)Ar/~(39)Ar年代學(xué)證據(jù)[J];吉林大學(xué)學(xué)報(bào)(地球科學(xué)版);2008年06期

4 付長(zhǎng)亮;孫德有;魏紅艷;茍軍;;伊通新生代玄武巖地球化學(xué)成分差異性研究[J];吉林大學(xué)學(xué)報(bào)(地球科學(xué)版);2009年03期

5 周建波;韓杰;張興洲;曾維順;;牡丹江地區(qū)藍(lán)片巖的地球化學(xué)特征及其大地構(gòu)造意義[J];吉林大學(xué)學(xué)報(bào)(地球科學(xué)版);2010年01期

6 劉永江;張興洲;金巍;遲效國;王成文;馬志紅;韓國卿;溫泉波;趙英利;王文弟;趙喜峰;;東北地區(qū)晚古生代區(qū)域構(gòu)造演化[J];中國地質(zhì);2010年04期

7 李春昱,王荃,劉雪亞,湯耀慶;亞洲大地構(gòu)造的演化[J];中國地質(zhì)科學(xué)院院報(bào);1984年03期

8 李錦軼，牛寶貴，宋彪, 徐文喜，張雨紅;黑龍江省東部中太古代碎屑巖漿鋯石的發(fā)現(xiàn)及其地質(zhì)意義[J];地球?qū)W報(bào);1995年03期

9 任紀(jì)舜,牛寶貴,劉志剛;軟碰撞、疊覆造山和多旋回縫合作用[J];地學(xué)前緣;1999年03期

10 鄧晉福,莫宣學(xué),羅照華,趙海玲,趙國春,曹永清,于學(xué)政;火成巖構(gòu)造組合與殼-幔成礦系統(tǒng)[J];地學(xué)前緣;1999年02期

本文編號(hào)：1814233