發(fā)布時(shí)間：2019-01-17 13:17

【摘要】：膠-遼-吉古元古代造山/活動(dòng)帶的遼東黃花甸地區(qū)出露大量古元古代花崗質(zhì)巖石,前人將該區(qū)的花崗質(zhì)巖石統(tǒng)稱為花崗質(zhì)混雜巖。本文通過詳細(xì)的野外地質(zhì)調(diào)查和室內(nèi)綜合研究,將該套花崗質(zhì)混雜巖解體為時(shí)代及性質(zhì)完全不同的兩類花崗巖——黑云母二長(zhǎng)花崗巖和花崗閃長(zhǎng)巖。其中黑云母二長(zhǎng)花崗巖具有塊狀、條痕狀、片麻狀的不同構(gòu)造類型,均顯示富SiO_2(72.37%~77.44%)、貧Al_2O_3(11.69%~13.21%)、富K_2O(3.97%~5.11%)的特征,Na_2O/K_2O=0.64~1.08,TiO_2含量在0.18%~0.34%之間,MnO、MgO和P_2O_5的含量較低,分別為0.01%~0.07%、0.12%~0.32%和0.01%~0.06%,鋁飽和指數(shù)A/CNK集中分布在1.33~1.45之間,A/NK在1.49~2.60之間,屬于過鋁質(zhì)高鉀鈣堿性系列;微量元素Sr、Ba、Ti、P強(qiáng)烈虧損,具有明顯的Eu負(fù)異常,具有A型花崗巖的特征。黑云母二長(zhǎng)花崗巖的鋯石大部分為具有清晰震蕩環(huán)帶結(jié)構(gòu)的巖漿鋯石,從3個(gè)樣品獲得LA-ICP-MS鋯石U-Pb諧和年齡分別為2185±29Ma、2183±13Ma、2166±10Ma,據(jù)目前所獲得南遼河群碎屑鋯石年齡(1.95~2.15Ga),本文認(rèn)為黑云母二長(zhǎng)花崗巖的侵位時(shí)代要早于南遼河群地層沉積的時(shí)間,構(gòu)成了南遼河群地層沉積的基底�；◢忛W長(zhǎng)巖呈巖枝狀侵入黑云母二長(zhǎng)花崗巖和里爾峪組地層中,富SiO_2(72.54%~74.31%)、Al_2O_3(15.01%~16.17%),全堿(K_2O+Na_2O)平均7.77%,相對(duì)富鈉(Na_2O/K_2O=1.27~2.82),貧鈣、鎂,MgO平均為0.26%,CaO平均為1.59%,Mg#值平均為54.0,鋁飽和指數(shù)A/CNK集中分布在1.61~1.78之間,A/NK在1.49~2.60之間,屬于過鋁質(zhì)鈣堿性系列,具明顯的Eu正異常,Y/Yb低,Sr/Y高,而且強(qiáng)烈虧損Th、Ta、Nb、Ti等高場(chǎng)強(qiáng)元素,富集Ba、K、Rb、Sr等低場(chǎng)強(qiáng)元素,具有埃達(dá)克質(zhì)花崗巖的特征�；◢忛W長(zhǎng)巖的鋯石大部分為具有清晰震蕩環(huán)帶結(jié)構(gòu)的巖漿鋯石,從2個(gè)樣品獲得LAICP-MS鋯石U-Pb年齡分別為1995±18Ma、1995±13Ma�？梢酝茢嗷◢忛W長(zhǎng)巖的侵位時(shí)代為2.0Ga左右。本文認(rèn)為具有A型特征的黑云二長(zhǎng)花崗巖是陸塊內(nèi)部拉伸減薄-裂解過程中下部地殼部分熔融的產(chǎn)物,具有埃達(dá)克質(zhì)特征的花崗閃長(zhǎng)巖是俯沖過程中所形成火山弧或活動(dòng)大陸邊緣巖漿活動(dòng)的產(chǎn)物。以上研究表明膠-遼-吉古元古代造山/活動(dòng)帶可能經(jīng)歷了在2.2~2.15Ga左右的拉伸裂解過程和2.0Ga左右俯沖擠壓的構(gòu)造演化過程。
[Abstract]:A large number of ancient Gu Yuan granitic rocks were exposed in Huanghuadian area of the Jiao-Liaoji-Jiguo Paleoproterozoic orogenic / active belt, and the granitic rocks in this area were generally called granitic melange. Based on detailed field geological investigation and laboratory comprehensive study, the granitic melange is disintegrated into two types of granitoids, biotite monzogranite and granodiorite, which are of completely different ages and properties. Among them, biotite monomorphic granites are of block, stripe and gneiss types, all of which are rich in SiO_2 (72.37%) and poor in Al_2O_3 (11.6910%, 13.21%), and are rich in SiO_2 (77.44%) and poor in Al_2O_3 (13.21%). The content of Na_2O/K_2O=0.64~1.08,TiO_2 is between 0.18% and 0.34%, and the contents of MnO,MgO and P_2O_5 are lower, 0.01and 0.07%, respectively. 0.12 0.32% and 0.01% respectively. The aluminum saturation index (A/CNK) was distributed in the range of 1.33 ~ 1.45 and the A/NK was in the range of 1.49 ~ 2.60, belonging to the peraluminous high-potassium calc-alkaline series. The trace element Sr,Ba,Ti,P is strongly depleted and has obvious negative Eu anomaly, which is characterized by A-type granite. The zircon of biotite monzonitic granite is mostly magmatic zircon with clear concussion ring structure. The U-Pb harmonic age of LA-ICP-MS zircon is 2185 鹵29 Ma, 2183 鹵13 Ma, 2166 鹵10 Ma, respectively, from three samples. According to the zircon age (1.95~2.15Ga) of the South Liaohe Group, it is believed that the emplacement age of biotite monzogranites is earlier than that of the South Liaohe Group, which constitutes the basement of the South Liaohe Group. The granodiorite intruded into the formation of biotite monzogranite and Lianyu formation in the form of branching, rich in SiO_2 (72.54 and 74.31%), Al_2O_3 (15.01%) and K _ 2O Na_2O (7.77% on average). Relative sodium rich (Na_2O/K_2O=1.27~2.82), poor calcium, magnesium, MgO were 0.26% Cao, the average value of Mg# was 54.0, and the A/CNK of aluminum saturation index was 1.61 ~ 1.78, respectively. A/NK is between 1.49 and 2.60, belongs to peraluminous calc-alkaline series, with obvious positive Eu anomaly, low Y/Yb, high Sr/Y, and strong loss of Th,Ta,Nb,Ti and other high field strength elements, enriched Ba,K,Rb,. Sr and other low field elements have the characteristics of adakitic granite. The zircon of granodiorite is mostly magmatic zircon with clear concussion ring structure. The U-Pb age of LAICP-MS zircon obtained from two samples is 1995 鹵18Ma1995 鹵13Ma. It can be inferred that the emplacement age of granodiorite is about 2.0Ga. In this paper, it is considered that the black cloud monzogranite with A-type characteristics is the product of partial melting of the lower crust in the process of extensional thinning and splitting of the continental block. The granodiorite with adakitic characteristics is the product of volcanic arc or active continental margin magma formed during subduction. The above studies indicate that the Jiao-Liaojianguo Proterozoic orogenic / active belt may have undergone the process of tensile cracking around 2.2~2.15Ga and the tectonic evolution of subduction and compression around 2.0Ga.
【作者單位】： 吉林大學(xué)地球科學(xué)學(xué)院;中國(guó)地質(zhì)科學(xué)院地質(zhì)研究所;
【基金】：國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(41430210) 中國(guó)地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(DD20160121)聯(lián)合資助
【分類號(hào)】：P588.1

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