東準(zhǔn)噶爾淖毛湖地區(qū)晚古生代花崗巖成因及地質(zhì)意義
發(fā)布時(shí)間：2019-05-23 12:35
【摘要】：淖毛湖地區(qū)發(fā)育大量與早-中古生代的弧型巖漿巖有關(guān)的金屬礦產(chǎn),特別是斑巖型銅、金等礦床。這種成礦作用是否延續(xù)到了晚古生代有待進(jìn)一步研究。本次研究通過詳細(xì)的鋯石U-Pb定年,地球化學(xué)和Hf同位素綜合研究,并結(jié)合區(qū)域?qū)Ρ?探討其形成構(gòu)造環(huán)境,以期為研究該區(qū)域的構(gòu)造演化和晚古生代巖漿活動(dòng)與成礦作用提供有益信息。本文針對(duì)以上所存在的問題對(duì)淖毛湖地區(qū)三處晚古生代花崗巖體進(jìn)行了詳細(xì)的野外調(diào)研,并進(jìn)行了巖石學(xué)、礦物學(xué)、鋯石U-Pb年代學(xué)、地球化學(xué)以及鋯石Hf同位素研究,取得了以下成果:1.灰西溝二長巖體鋯石U-Pb年齡分別為337±2Ma,形成于早石炭世晚期,而不是以往認(rèn)為的二疊紀(jì)。駱駝石頭溝二長巖體鋯石U-Pb年齡分別為337±2Ma,形成于早石炭世晚期,而不是以往認(rèn)為的二疊紀(jì)。寶西二長巖體鋯石U-Pb年齡分別為340±1Ma,形成于早石炭世晚期,而不是以往認(rèn)為的二疊紀(jì)。2.灰西溝巖體巖石類型為二長花崗巖,呈鈣堿性-高鉀鈣堿性的準(zhǔn)鋁質(zhì)-弱過鋁質(zhì),虧損Nb、Ta、P和Ti等高場(chǎng)強(qiáng)元素,相對(duì)富集Rb、Ba、K、Sr等大離子親石元素,屬高Ba-Sr的I型花崗巖,具有正的εHf(t)值(+15.8~+16.4)和年輕的Hf模式年齡TDM=311~355Ma,,基性下地殼部分熔融的產(chǎn)物,并伴隨有分離結(jié)晶作用。駱駝石頭溝巖體巖石類型為二長花崗巖,呈鈣堿性-高鉀鈣堿性的準(zhǔn)鋁質(zhì)-弱過鋁質(zhì),虧損Nb、Ta、P和Ti等高場(chǎng)強(qiáng)元素,相對(duì)富集Rb、Ba、K、Sr等大離子親石元素,屬高Ba-Sr的I型花崗巖,具有正的εHf(t)值(+13.4~+16.4)和年輕的Hf模式年齡TDM=304~432Ma,,基性下地殼部分熔融的產(chǎn)物,并伴隨有分離結(jié)晶作用。寶西巖體的巖石類型為二長花崗巖,呈高鉀鈣堿性的準(zhǔn)鋁質(zhì)-弱過鋁質(zhì),虧損Nb、Ta、P和Ti等高場(chǎng)強(qiáng)元素,相對(duì)富集Rb、Ba、K、Sr等大離子親石元素,屬高Ba-Sr的I型花崗巖,同時(shí)其具有較高的εHf(t)值(+12.0~+15.1),應(yīng)是在從俯沖向碰撞/后造山的構(gòu)造體制轉(zhuǎn)換階段下,幔源物質(zhì)上涌注入基性下地殼部分熔融產(chǎn)生的巖漿發(fā)生混合作用并伴隨分離結(jié)晶過程的產(chǎn)物。
[Abstract]:A large number of metal minerals, especially porphyry copper and gold deposits, are developed in the Naomaohu area, especially related to the early to Middle Paleozoic arc magmatic rocks. Whether this mineralization continued into the late Paleozoic remains to be further studied. In this study, the tectonic environment of zircon formation is discussed through a detailed study of zircon U-Pb dating, geochemistry and Hf isotopes, and combined with regional correlation. In order to provide useful information for the study of tectonic evolution and late Paleozoic magmatic activity and mineralization in this area. In view of the above problems, this paper makes a detailed field investigation of three late Paleozoic granites in Nur Maohu area, and studies petrology, Mineralogy, zircon U-Pb chronology, geochemistry and zircon Hf isotopes. The following results have been achieved: 1. The zircon U-Pb ages of the Huexigou feldspar rock mass are 337 鹵2Ma, respectively, which were formed in the late early Devonian, rather than the Permian thought in the past. The zircon U-Pb ages of the camel Shitougou feldspar are 337 鹵2Ma, respectively, which were formed in the late early Carboniferous, rather than the Permian thought in the past. The zircon U-Pb ages of Baoxi feldspar are 340 鹵1Ma, which were formed in the late early Carboniferous, rather than the Permian. 2. The rock type of Huexigou rock mass is monzonitic granite, which is calc-alkaline-high potassium calc-alkaline quasi-aluminite-weak peraluminite, deficient in high field strength elements such as Nb,Ta,P and Ti, and relatively enriched in large ion lithophile elements such as Rb,Ba,K,Sr. The type I granite, which belongs to high Ba-Sr, has a positive Hf (t) value (15.8 ~ 16.4) and a young Hf model age of TDM=311~355Ma,, basic lower crustal partial melting products, accompanied by separation and crystallization. The rock type of camel Shigou rock mass is monzonitic granite, which is calc-alkaline-high potassium calc-alkaline quasi-aluminite-weak peraluminite, deficient in high field strength elements such as Nb,Ta,P and Ti, and relatively enriched in large ion lithophile elements such as Rb,Ba,K,Sr. The type I granite, which belongs to high Ba-Sr, has a positive Hf (t) value (13.4 ~ 16.4) and a young Hf model age of TDM=304~432Ma,, basic lower crustal partial melting products, accompanied by separation and crystallization. The rock type of Baoxi rock mass is monzonitic granite, which is quasi-aluminite-weak peraluminite with high potassium calc-alkalinity, which is deficient in high field strength elements such as Nb,Ta,P and Ti, and is relatively enriched in large ion lithophile elements such as Rb,Ba,K,Sr. It belongs to type I granite with high Ba-Sr, and has a high 蔚 Hf (t) value (12.0 ~ 15.1), which should be in the tectonic system transformation stage from subduction to collision / backward orogeny. The upwelling of mantle-derived materials into the magma produced by the partial melting of the basic lower crust mixes and is accompanied by the separation and crystallization process.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P588.121
本文編號(hào)：2483898
[Abstract]:A large number of metal minerals, especially porphyry copper and gold deposits, are developed in the Naomaohu area, especially related to the early to Middle Paleozoic arc magmatic rocks. Whether this mineralization continued into the late Paleozoic remains to be further studied. In this study, the tectonic environment of zircon formation is discussed through a detailed study of zircon U-Pb dating, geochemistry and Hf isotopes, and combined with regional correlation. In order to provide useful information for the study of tectonic evolution and late Paleozoic magmatic activity and mineralization in this area. In view of the above problems, this paper makes a detailed field investigation of three late Paleozoic granites in Nur Maohu area, and studies petrology, Mineralogy, zircon U-Pb chronology, geochemistry and zircon Hf isotopes. The following results have been achieved: 1. The zircon U-Pb ages of the Huexigou feldspar rock mass are 337 鹵2Ma, respectively, which were formed in the late early Devonian, rather than the Permian thought in the past. The zircon U-Pb ages of the camel Shitougou feldspar are 337 鹵2Ma, respectively, which were formed in the late early Carboniferous, rather than the Permian thought in the past. The zircon U-Pb ages of Baoxi feldspar are 340 鹵1Ma, which were formed in the late early Carboniferous, rather than the Permian. 2. The rock type of Huexigou rock mass is monzonitic granite, which is calc-alkaline-high potassium calc-alkaline quasi-aluminite-weak peraluminite, deficient in high field strength elements such as Nb,Ta,P and Ti, and relatively enriched in large ion lithophile elements such as Rb,Ba,K,Sr. The type I granite, which belongs to high Ba-Sr, has a positive Hf (t) value (15.8 ~ 16.4) and a young Hf model age of TDM=311~355Ma,, basic lower crustal partial melting products, accompanied by separation and crystallization. The rock type of camel Shigou rock mass is monzonitic granite, which is calc-alkaline-high potassium calc-alkaline quasi-aluminite-weak peraluminite, deficient in high field strength elements such as Nb,Ta,P and Ti, and relatively enriched in large ion lithophile elements such as Rb,Ba,K,Sr. The type I granite, which belongs to high Ba-Sr, has a positive Hf (t) value (13.4 ~ 16.4) and a young Hf model age of TDM=304~432Ma,, basic lower crustal partial melting products, accompanied by separation and crystallization. The rock type of Baoxi rock mass is monzonitic granite, which is quasi-aluminite-weak peraluminite with high potassium calc-alkalinity, which is deficient in high field strength elements such as Nb,Ta,P and Ti, and is relatively enriched in large ion lithophile elements such as Rb,Ba,K,Sr. It belongs to type I granite with high Ba-Sr, and has a high 蔚 Hf (t) value (12.0 ~ 15.1), which should be in the tectonic system transformation stage from subduction to collision / backward orogeny. The upwelling of mantle-derived materials into the magma produced by the partial melting of the basic lower crust mixes and is accompanied by the separation and crystallization process.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P588.121
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