本文選題：庫魯克塔格 + 古元古代早期�。� 參考：《新疆大學(xué)》2017年碩士論文

【摘要】：庫魯克塔格地塊西山口興地塔格群下亞群淺粒巖組,普遍受到早元古代角閃巖相-麻粒巖相的變質(zhì)作用。區(qū)域上淺粒巖組、片麻巖組、變質(zhì)花崗質(zhì)巖體,密切共生,被認(rèn)為是古老地殼發(fā)生深熔作用的證據(jù)。本論文通過;1)深熔作用的野外宏觀證據(jù),2)淺粒巖組的原巖恢復(fù),3)殘余體與新生體的稀土元素對比,4)深熔作用的鏡下特征,5)有關(guān)的鋯石U-Pb年代學(xué)證據(jù),6)相關(guān)變質(zhì)作用的溫壓條件估算7)對變質(zhì)花崗質(zhì)巖體形成的構(gòu)造背景探討。結(jié)合這幾點(diǎn)來對庫魯克塔格地區(qū)古元古代深熔作用進(jìn)行時(shí)間上、程度上、階段上的約束,對與此次深熔作用有關(guān)的造山帶背景進(jìn)行探討。并在塔里木克拉通周邊前寒武地塊出露區(qū)域,進(jìn)行同期的造山帶對比。結(jié)合全球造山事件,推測庫魯克塔格地區(qū)深熔作用是1.9Ga哥倫比亞大陸聚合的響應(yīng)。庫魯克塔格地塊西山口興地塔格群下亞群淺粒巖組,在地層中,尤其是褶皺端部等構(gòu)造有利部位,廣泛存在以透鏡狀、臘腸狀、細(xì)脈狀的淺色熔融新生體與變質(zhì)閃長巖體。樣品采自淺粒巖組中,巖性為二長淺粒巖、含石榴石斜長淺粒巖(兩者被視為深熔殘余體)、以及變質(zhì)石英閃長巖(視為深熔新生溶體),淺粒巖組鏡下可見變余層理以及在特定部位礦物顆粒明顯增大與典型的熔融石英特征。二長淺粒巖變質(zhì)礦物組合為Pl+Bi+Q,屬低角閃巖相變質(zhì),含石榴石斜(鉀)長淺粒巖峰期變質(zhì)礦物組合為Pl+K+Gr+Q或Pl+Gr+Q為角閃巖相。兩組樣后期黑云母、石榴石等礦物被被絹云母等交代,顯示為綠片巖相。綜合顯示該變質(zhì)地層經(jīng)過了低角閃巖相-角閃巖相-綠片巖相的順時(shí)針Pt軌跡,這種軌跡符合碰撞造山的Pt軌跡。原巖的恢復(fù)顯示,淺粒巖組原巖為一套雜砂巖組。其鋯石普遍受到重熔,其核部年齡可視為深熔作用發(fā)生的時(shí)間(測得變質(zhì)年齡1950±30Ma)。變質(zhì)閃長巖鋯石核部具有明顯的巖漿鋯石特征(測得巖體年齡1893±15Ma),對其形成的因素,在本人地球化學(xué)特征與前人Hf-O同位素工作的基礎(chǔ)上,認(rèn)為這期花崗巖在形成上涉及在地殼劇烈加厚過程中,新生基性下地殼與古老地殼兩者熔融再造的混合,且混合可能發(fā)生在淺部地殼,其中黑云母脫水,對熔融作用的貢獻(xiàn)較大。綜合以上觀點(diǎn)說明,與石英閃長巖(1893±15Ma)有關(guān)的巖漿事件,是以興地塔格群雜砂巖組為深熔母巖,經(jīng)過深熔作用的產(chǎn)物。且這次深熔作用的機(jī)制與古元古代晚期造山事件引起的地殼加厚有關(guān)。根據(jù)樣品的變質(zhì)程度,本人認(rèn)為二長淺粒巖、含石榴石斜長淺粒巖分別代表了研究區(qū)深熔程度由低到高的變化,并結(jié)合該期花崗質(zhì)巖體形成機(jī)制。推測與這次深熔作用有關(guān)的造山帶類型,為碰撞造山帶,原先沉積的地層,因板塊碰撞,引起強(qiáng)烈的地殼加厚,在加厚升溫的過程中發(fā)生初期的深熔作用,特征上以二長淺粒巖與淺色長英質(zhì)脈體共生為特征,在變質(zhì)作達(dá)到峰期時(shí),形成含石榴石斜長淺粒巖與長英質(zhì)透鏡體,塊體共生的特征,若溶體進(jìn)一步聚集則形成原地或半原地的花崗閃長質(zhì)巖體。同時(shí),通過對這次造山事件與同期塔里木周邊的造山事件的對比,本人認(rèn)為這次造山事件與1.9Ga左右的Columbia超大陸匯聚有關(guān),進(jìn)而說明研究區(qū),庫魯克塔格古元古代深熔事件,是Columbia超大陸集合的響應(yīng)。
[Abstract]:The subgroup of subgroup in the lower subgroup of the Xishan estuary subgroup in the Xishan block of the quttg block is generally subjected to metamorphism of the early Proterozoic amphibolite facies and granulite facies. The regional superficial granulite group, the gneiss group and the metamorphic granitic rock mass are closely symbiotic, which are considered to be the evidence of the deep melting of the ancient crustal. 1) the field macroscopic view of the deep melting. Evidence, 2) the restoration of the primary rock in the shallow granulite group, 3) the contrast between the remnants and the rare earth elements, 4) the characteristics of the deep penetration, 5) the related zircon U-Pb chronological evidence, 6) the estimation of the temperature and pressure conditions of the related metamorphism 7) and the structural background of the metamorphic granitic rock formation. The deep melting process, in time, degree and stage constraints, discusses the orogenic belt background related to the deep melting, and the outcropping area of the Precambrian block around the Tarim Craton and contrasting the orogenic belt at the same period. Combined with the global orogenic event, the deep melting of the Kuru katG region is 1.9Ga Columbia continent. The response of the polymerization. The subgroup of the subgroup of the subgroup of the Xishan Dagg group in the Xishan block of the qutagg block, in the formation, especially in the end of the fold, is widely used as a lenticular, dachshund and fine vein light molten freshman and metamorphic diorite. The sample is collected from the shallow granulite group, and the lithology is two long light granulites, and the garnet is inclined. The long light granulites (both are regarded as deep melting remnants) and metamorphic quartz diorite (as deep melting new dissolved bodies), the light granulites can be seen under the microscope, and the mineral particles in the specific parts are obviously enlarged and the typical fused silica features. The metamorphic minerals of the two long granites are composed of Pl+Bi+Q, low amphibolite facies metamorphism, and garnet oblique (potassium). The metamorphic mineral assemblages in the peak period of the long shallow kernels are Pl+K+Gr+Q or Pl+Gr+Q amphibolite facies. The two groups of anaphase anaphase, garnet and other minerals were metasomatism by sericite, which were shown as greenschist facies. The metamorphic strata showed that the metamorphic stratum passed the clockwise Pt locus of the amphibolite facies and greenschist facies of the amphibolite facies, which accorded with the collision orogenic Pt. The restoration of the original rock shows that the original rock of the shallow granulite group is a set of hetero sandstone group. Its zircon is generally remelted, the age of its nucleus can be seen as the time of deep melting (1950 + 30Ma). The zircon core of the metamorphic diorite has obvious characteristics of the magma zircon (the age of 1893 + 15Ma). On the basis of the geochemical characteristics of the human geochemistry and the previous work of Hf-O isotopes of the predecessors, it is believed that the granites are involved in the process of severe crustal thickening, and the mixture of the new basal lower crust and the ancient crust is mixed, and the mixture may occur in the shallow crust, in which the black cloud mother dehydrated and contributed greatly to the melting effect. It is pointed out that the magmatic events associated with quartz diorite (1893 + 15Ma) are the products of the deep melting parent rock in the Xingdi TGGE group complex sandstone group, which is related to the crustal thickening caused by the late Proterozoic orogeny. According to the metamorphic degree of the samples, I think two long granites, including pomegranates. It represents the change in the degree of deep melting from low to high and the formation mechanism of granitic rock mass in the study area. It is speculated that the type of orogenic belt, which is related to the deep melting, is the collision orogenic belt, the original sedimentary strata, the strong crust thickening caused by the collision of the plate, and the initial stage during the thickening of the heating process. The deep melting is characterized by the symbiosis between the two long granitoids and the light colored felsic veins. In the peak period of the metamorphic metamorphism, the granitoids with long granitoids and long angled lenticular bodies are formed, and the masses are symbiotic. If the dissolved body is further aggregated, the original or semi original granodiorite bodies are formed. In the same period of the comparison of orogenic events around the Tarim, I think the orogenic event is related to the Columbia supercontinent convergence around 1.9Ga, and then the study area, the Palaeoproterozoic Proterozoic deep melting event in the study area is the response of the Columbia supercontinent collection.
【學(xué)位授予單位】：新疆大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P542;P534.3

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 董漢文;許志琴;李源;劉釗;;東喜馬拉雅構(gòu)造結(jié)墨脫地區(qū)晚三疊世深熔作用的鋯石U-Pb年代限定[J];大地構(gòu)造與成礦學(xué);2014年02期

2 程裕淇,萬渝生,高吉鳳;河北平山小覺地區(qū)阜平群變質(zhì)作用和深熔作用同位素年代研究的初步報(bào)道[J];地質(zhì)學(xué)報(bào);2000年01期

3 何政偉,侯中健,魏顯貴,肖淵甫,馬潤則,劉援朝,吳德超;米倉山結(jié)晶基底中深熔作用的巖石學(xué)特征[J];礦物巖石;1998年S1期

4 沈昆,沈其韓,徐惠芬,耿元生;山東省沂水汞丹山地塊與深熔作用有關(guān)的變質(zhì)流體[J];巖石礦物學(xué)雜志;1998年03期

5 李兆麟;;變質(zhì)深熔作用與成巖成礦關(guān)系研究[J];礦床地質(zhì);2002年S1期

6 劉戈;王彥華;;深熔作用巖相學(xué)標(biāo)志的實(shí)驗(yàn)研究[J];吉林地質(zhì);2010年04期

7 李兆麟;關(guān)于變質(zhì)深熔作用與成巖成礦關(guān)系的思考[J];地學(xué)前緣;2001年03期

8 劉福來;王舫;劉平華;;北蘇魯威海地區(qū)偉晶巖的形成過程及其與超高壓巖石深熔作用的成因關(guān)系[J];地質(zhì)學(xué)報(bào);2009年11期

9 D.F.Strong;C.Dupuy;王一先;;雙峰態(tài)的派吞山巖基中的稀土元素:地幔派生巖漿的地殼深熔作用證據(jù)[J];地質(zhì)地球化學(xué);1984年06期

10 于勝堯;張建新;孫德有;李云帥;宮江華;;柴北緣大陸深俯沖板片折返過程中的深熔作用研究[J];巖石學(xué)報(bào);2014年08期

相關(guān)會議論文 前2條

1 任留東;;南極拉斯曼丘陵硼硅酸鹽礦物演化及其與深熔作用的關(guān)系[A];第四屆全國青年地質(zhì)工作者學(xué)術(shù)討論會論文集[C];1999年

2 張西平;;深熔作用及有關(guān)問題[A];第四屆全國青年地質(zhì)工作者學(xué)術(shù)討論會論文集[C];1999年

相關(guān)博士學(xué)位論文 前1條

1 劉銳;華夏地塊前海西期地殼深熔作用[D];中國地質(zhì)大學(xué);2009年

相關(guān)碩士學(xué)位論文 前2條

1 郭羽;新疆庫魯克塔格早元古代地殼深熔與地質(zhì)演化[D];新疆大學(xué);2017年

2 王丹;華夏云開地區(qū)早古生代地殼深熔作用及其地質(zhì)意義[D];中國地質(zhì)大學(xué);2013年

，

本文編號：1949089