本文選題：黑龍江省　切入點(diǎn)：東安-湯旺河地區(qū)　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：東安-湯旺河地區(qū)位于小興安嶺北緣,松嫩地塊與佳木斯地塊的銜接地帶。本文對(duì)位于該研究區(qū)的東安金礦區(qū)、平頂山金礦區(qū)、翠宏山多金屬礦區(qū)分布的典型花崗巖體進(jìn)行了巖石學(xué)、鋯石U-Pb年代學(xué)、元素地球化學(xué)研究,探討了巖體的成因及形成的大地構(gòu)造背景;通過鋯石、磷灰石裂變徑跡熱年代學(xué)結(jié)合其他同位素年齡研究了巖體自侵位以來的熱史演化過程,結(jié)合地溫梯度計(jì)算了巖體在不同階段的冷卻速率、隆升速率和區(qū)域剝蝕量,并進(jìn)一步探討了造成巖體不均一的抬升剝蝕階段的地質(zhì)構(gòu)造背景。巖石地球化學(xué)研究顯示,平頂山巖體形成于晚古生代(259±1Ma),高鉀鈣堿性系列弱過鋁質(zhì)的相對(duì)富鈣、貧鐵、鎂,由I型向A型過渡型花崗巖,源區(qū)物質(zhì)來自下地殼物質(zhì)的部分熔融,形成于華北板塊與西伯利亞板塊碰撞拼貼過程中伴隨的陸內(nèi)塊體間的碰撞機(jī)制下;翠宏山巖體形成于晚三疊世(200±1Ma),為高鉀鈣堿性系列準(zhǔn)鋁質(zhì)-弱過鋁質(zhì)過渡的貧鈣、鐵、鎂的A型花崗巖,源區(qū)物質(zhì)表現(xiàn)為殼�；旌闲�,以殼源為主,形成于華北板塊與西伯利亞板塊碰撞造山古亞洲洋最終閉合后的伸展機(jī)制下;東安巖體形成于早侏羅世(188±1Ma),為高鉀鈣堿性系列弱過鋁質(zhì)的貧鈣、鐵、鎂巖,為形成于早侏羅世古太平洋板塊持續(xù)俯沖機(jī)制下的以地殼物質(zhì)為主,部分幔源物質(zhì)加入的A型中粗粒堿長(zhǎng)花崗巖。因三類花崗巖AFT與ZFT值遠(yuǎn)遠(yuǎn)小于巖體的形成年齡,磷灰石裂變徑跡長(zhǎng)度分布均表現(xiàn)出近矮而寬的單峰分布,且徑跡長(zhǎng)度遠(yuǎn)小于裂變徑跡的標(biāo)準(zhǔn)初始徑跡長(zhǎng)度16.3um,樣品的單顆粒年齡值相對(duì)分散,說明磷灰石在漫長(zhǎng)的地質(zhì)歷史過程中經(jīng)歷的較為緩慢的冷卻退火過程。翠宏山巖體AFT大于平頂山巖體,平頂山巖體AFT大于東安巖體,這種裂變徑跡年齡的差異反應(yīng)了研究區(qū)不均勻的構(gòu)造抬升格局,表明翠宏山巖體晚中生代以來較早經(jīng)歷抬升剝蝕,平頂山巖體較晚抬升至磷灰石裂變徑跡退火帶底部溫度等溫面。樣品的AFT值與樣品所在高度之間反映出明顯的正相關(guān)性,說明隨著巖體隆升與冷卻作用的進(jìn)行,較高處樣品相對(duì)較早的抬升到裂變徑跡部分退火帶底部;巖體樣品的部分磷灰石裂變徑跡年齡值與樣品所在高度之間不具有正相關(guān)性,可能是巖體在抬升通過110±10°C的等溫面深度后局部遭受小規(guī)模構(gòu)造運(yùn)動(dòng)的影響,使該區(qū)巖體發(fā)生局部性的逆沖推覆等情況。通過磷灰石裂變徑跡熱歷史模擬,結(jié)合鋯石裂變徑跡年齡、黑云母K-Ar年齡及鋯石U-Pb年齡,表明巖體自侵位以來經(jīng)歷了不均勻的冷卻降溫過程;由樣品在不同階段的冷卻速率、隆升速率及隆升量,總體表現(xiàn)為3個(gè)階段的不均一的抬升及剝蝕;根據(jù)現(xiàn)代大陸平均剝蝕速率獲得研究區(qū)自早侏羅世以來區(qū)域剝蝕深度在6.5Km左右;3個(gè)階段不均一的抬升剝蝕過程很可能是由于古太平洋板塊持續(xù)俯沖伴隨的軟流圈地幔物質(zhì)底侵上涌以及陸內(nèi)造山運(yùn)動(dòng)綜合作用的結(jié)果。
[Abstract]:Dongan area is located in the northern margin of Xingan mountains Tangwanghe, zone between Songnen massif and Jiamusi massif. The study area is located in the Dongan gold mine, Pingdingshan gold mining area, the typical granite Distribution cuihongshan polymetallic mining area of petrography, U-Pb zircon geochronology, geochemistry of rock mass is discussed, and the causes of the tectonic background; the zircon and apatite fission track thermal history of rock mass from emplacement since in combination with other isotopic age evolution of rock mass in the same stage of the cooling rate was calculated with the temperature gradient, the uplift rate and regional denudation, and further discusses the geological background caused by the inhomogeneity of rock mass the uplift and denudation stage. Geochemical study shows that the Pingdingshan rock formed in the late Paleozoic (259 + 1Ma), high potassium calc alkaline series weak peraluminous Relatively rich in calcium, magnesium, iron poor, from I type to A type transition type granite, partial melting of source material from the lower crust, formed in the North China plate and the Siberia plate collision collage process with the intracontinent block collision mechanism; cuihongshan rock formed in Late Triassic three (200 + 1Ma), high potassium calc alkaline series metaluminous had poor calcium, aluminum transition iron, magnesium A type granite, source material for crust mantle mixed type, derived mainly from the crust, formed in the extensional mechanism of the North China plate and the Siberia plate collision after the final closure of the paleo Asian Ocean Dongan; rock formed in the early Jurassic (188 + 1Ma), high potassium calc alkaline series weak poor calcium aluminum, iron, magnesium and rock, was formed in the early Jurassic paleo Pacific plate subduction mechanism under the crust, coarse grained alkali type A part of the mantle material into the granite because of the three. Type of granite AFT and ZFT value is far less than the formation age of rock mass, apatite fission track length distribution showed in short and wide unimodal distribution, the standard initial track length 16.3um and track length is far less than the fission track age, single particle sample value is relatively dispersed, that experience in the geological history of apatite in the process of long time is slow cooling annealing process. The cuihongshan rock rock rock AFT is greater than Pingdingshan, Pingdingshan, Dongan more than AFT rock mass, the difference of fission track age reaction in the study area the uneven pattern of tectonic uplift, the Cuihong mountain rock uplift since Late Mesozoic early experience, Pingdingshan rock later uplifted to the apatite fission track annealing with the bottom temperature the isothermal surface between the sample AFT value. The samples and the height reflects a significant positive correlation, with rock uplift and cooling effect The sample is high, relatively early uplift to the fission track annealing zone at the bottom part of the rock sample; part of the apatite fission track age value and the height between the sample does not have positive correlation, may be the isotherm depth of rock mass in uplift by 110 + 10 ~ C after the Bureau of the Ministry of small scale affected by tectonic movement, the the local rock mass of thrust nappe and so on. Through the apatite fission track thermal history simulation, combined with the zircon fission track age, biotite and K-Ar ages of zircon U-Pb age, shows that the rock mass self emplacement has experienced uneven cooling process; the cooling rate of samples in different stages, the uplift rate the uplift amount, the overall performance of uplift and denudation of the 3 phases are not uniform; according to the average erosion rate of modern China to get the study area since the early Jurassic since the regional denudation depth of around 6.5Km; 3 The process of uplift and denudation at different stages is probably due to the combined effect of continuous subduction of the paleo Pacific plate and asthenospheric mantle invasion and upwelling.

【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;P597.3

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