本文選題：花崗巖類　切入點(diǎn)：烏蘭德勒　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：烏蘭德勒鉬銅多金屬礦區(qū),花崗類巖石組構(gòu)反映了巖漿母體冷卻的過(guò)程。結(jié)合巖相學(xué)、巖體年代學(xué)和地球化學(xué)數(shù)據(jù),就可以提供巖漿演化過(guò)程中的物理—化學(xué)信息。將花崗類巖石分為四大類,即黑云母二長(zhǎng)花崗巖、中細(xì)�；◢弾r、花崗閃長(zhǎng)巖和花崗斑巖,通過(guò)對(duì)研究區(qū)巖石組構(gòu)和化學(xué)分析以及zk903鉆孔空間次序整合認(rèn)定黑云母二長(zhǎng)花崗巖和閃長(zhǎng)巖為早期巖體,后期的細(xì)�；◢弾r侵入老巖體中,形成了花崗斑巖、花崗閃長(zhǎng)巖等高分異類型的巖石。根據(jù)127組文獻(xiàn)鋯石年齡統(tǒng)計(jì),花崗類巖體的年齡主要集中在135-145Ma、160-165Ma(早燕山期)、290-320Ma和345-360Ma(海西期)。早燕山期花崗巖鋯石形態(tài)完整,色澤較淺,而海西期花崗巖鋯石形態(tài)殘缺,色澤發(fā)黑,多出現(xiàn)核部老、邊部新的鋯石�；◢忣悗r石Si O2含量為59%-79%,K2O+Na2O含量為3%-9%,Al2O3含量為9%-17%。Si O2與P2O5、K2O、Al2O3、Ti O2、Ca O、Mn O、Na2O、Mg O呈線性關(guān)系,呈現(xiàn)出典型的結(jié)晶分異的演化趨勢(shì),巖石表現(xiàn)出過(guò)鋁高鈣的特征,為I-A型。稀土元素配分圖為右傾式,出現(xiàn)銪(Eu)的負(fù)異常�；◢彴邘r和花崗閃長(zhǎng)巖較黑云母二長(zhǎng)花崗巖和中細(xì)�；◢弾r出現(xiàn)了稀土虧損,說(shuō)明了斜長(zhǎng)石和石英等淺色礦物大量的出溶分離—重結(jié)晶。古生代花崗巖地塊受到區(qū)域走滑應(yīng)力的影響,長(zhǎng)期受到拉張力作用,形成了方塊式的構(gòu)造樣式,正是這樣的構(gòu)造控制了燕山期巖體的侵入方式,造成了花崗質(zhì)巖漿對(duì)老巖體進(jìn)行了充分的混染以及熱液對(duì)成礦元素的充分萃取。輝鉬礦成礦年齡和Re含量對(duì)物質(zhì)來(lái)源的判定均與燕山期巖漿的混染和熱液作用密切相關(guān)。巖體空間演化關(guān)系和巖石地球化學(xué)數(shù)據(jù)綜合分析對(duì)巖漿系統(tǒng)的物理—化學(xué)過(guò)程和巖石成因都有相對(duì)綜合性的深刻認(rèn)識(shí)。
[Abstract]:The granitic rock fabric reflects the cooling process of the magmatic parent body in Wu Lan's molybdenum copper polymetallic ore area, combining with petrographic, geochronological and geochemical data. The granitic rocks can be divided into four types: biotite monzogranite, mesomorphic granite, granodiorite, granodiorite and granitic porphyry. Based on the analysis of rock fabric and chemistry in the study area and the spatial sequence integration of zk903 borehole, it is concluded that biotite monzogranite and diorite were early rock mass, and granitic porphyry was formed after fine-grained granite intruded into the old rock mass. According to the age statistics of 127 groups of zircon, the ages of granitic rocks are mainly 135-145Ma-160-165Ma (early Yanshanian 290-320Ma and 345-360Ma) (Hercynian). The zircons of early Yanshanian granites are of complete morphology and light color. The zircon morphology of Hercynian granite is incomplete, the color is black, the core is old and the edge is new. The Sio _ 2 content of granitic rocks is 59-79 and the content of K _ 2O Na2O is 3-9O / Al _ 2O _ 3. There is a linear relationship between the content of 9%-17%.Si _ 2O _ 2 and the content of P _ 2O _ 5-K _ 2O-Al _ 2O _ 3-Al _ 2O _ 3O _ 2SiO _ 2CaO _ 2mn _ 2O _ O _ 2O _ (Na _ 2O _ O _ 2O _ O). There is a typical evolution trend of crystallization differentiation. The rock shows the characteristics of peraluminous and high calcium, which is I-A type. The REE partition pattern is right-dip. There are negative anomalies of europium EU). Granitic porphyry and granodiorite show REE depletion compared with biotite monzomorphic granite and medium-fine-grained granite. This shows that a large number of light-colored minerals, such as plagioclase and quartz, are exsolution separated and recrystallized. The Paleozoic granite block was affected by the regional strike-slip stress and subjected to tensile tension for a long time, forming a block tectonic style. It is this kind of structure that controls the intrusive mode of the Yanshanian rock mass. The results show that granitic magma makes sufficient mixing of old rock mass and sufficient extraction of ore-forming elements by hydrothermal solution. The determination of metallogenic age and re content of molybdenum ore on material source is closely related to the mixing of Yanshanian magma and hydrothermal action. The spatial evolution relationship of rock mass and the comprehensive analysis of petrogeochemical data have a relatively comprehensive and profound understanding of the physico-chemical process and petrogenesis of magmatic system.
【學(xué)位授予單位】：中國(guó)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)】：P618.2;P588.121

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