CAJ | 학술논문

哈西亚图石英闪长岩是东昆仑地区中生代具幔源组分贡献的花岗岩类典型代表,岩体出露于东昆仑中构造带,广泛发育暗色微粒包体.包体为闪长质岩石,并含有一系列岩浆混合成因的证据,如水滴状、长条状塑性流变外形,淬冷边、反向脉等高—中温混合迹象,以及低 Mg/(Fe＋Mg )、Na/(Ca＋Na)值等混合成因特征.包体 A/CNK 值介于0．77~0．87,属准铝质,富 Al2 O3、Fe2 O3、MgO,贫K2 O、Na2 O,富集大离子亲石元素(Rb、Ba、K等),同时又具有Ta、Nb、Ti的“TNT”负异常,具有俯冲带幔源岩石的成分特点.依据岩石学、地球化学特征并结合同时期大地构造背景,东昆仑晚古生代—早中生代含暗色微粒包体花岗质岩石是幔源岩浆经历多次熔融、同化、存储和均一(MASH)过程后与壳源岩浆混合的产物.在混合岩浆中,富镁铁质端元是由辉长质岩浆进化而来的闪长质岩浆.
합서아도석영섬장암시동곤륜지구중생대구만원조분공헌적화강암류전형대표,암체출로우동곤륜중구조대,엄범발육암색미립포체.포체위섬장질암석,병함유일계렬암장혼합성인적증거,여수적상、장조상소성류변외형,쉬랭변、반향맥등고—중온혼합적상,이급저 Mg/(Fe＋Mg )、Na/(Ca＋Na)치등혼합성인특정.포체 A/CNK 치개우0．77~0．87,속준려질,부 Al2 O3、Fe2 O3、MgO,빈K2 O、Na2 O,부집대리자친석원소(Rb、Ba、K등),동시우구유Ta、Nb、Ti적“TNT”부이상,구유부충대만원암석적성분특점.의거암석학、지구화학특정병결합동시기대지구조배경,동곤륜만고생대—조중생대함암색미립포체화강질암석시만원암장경력다차용융、동화、존저화균일(MASH)과정후여각원암장혼합적산물.재혼합암장중,부미철질단원시유휘장질암장진화이래적섬장질암장.
Haxiyatu quartz diorite is one of the typical granites with the contribution of Mesozoic mantle-derived component in East Kunlun region.The outcrop of rock mass is located in the middle tectonic belt,and mafic microgranular enclaves develop widely.The enclave is diorite with a series of magma mixing origin evidences,such as water-drop and long strip plasticity rheological shape,high-middle temperature mixed sign including quenching boundary,reverse pulse,etc., and mixed origin including low values of Mg/(Fe+Mg)and Na/(Ca+Na).The A/CNK value of enclave is 0??77-0??87,belonging to quasi-aluminous;the enclaves are rich in Al2 O3 and Fe2 O3 , MgO,poor in K2 O and Na2 O;the enclaves are enriched in large ion lithophile elements (Rb,Ba, K,etc.),and have the characteristics of “TNT”negative anomaly for Ta,Nb and Ti,and the composition of subduction mantle-derived rock.According to the lithological and geochemical characteristics as well as tectonic setting in the same period,Neopaleozoic-Early Mesozoic granitic rocks with mafic microgranular enclaves in East Kunlun region is a product of crust-derived magma mixed with mantle-derived magma,which has experienced multiple melting,assimilation, storage and homogenization (MASH )processes.For the mixed magma,the iron end member rich in Mg is dioritic magma,which is evolved from gabbroic magma.