CAJ | 학술논문

在对老柞山矿床地质特征系统研究的基础上，对与成矿有关的岩石开展了进一步的主、微量元素地球化学测试分析。结果显示与成矿有关的花岗岩具富Sr、低Ti的高钾钙碱性火山弧花岗岩的特征，闪长玢岩具偏铝质钙碱性岩系列特征。岩石样品均呈现出富集轻稀土元素和大离子亲石元素（LILEs）、相对亏损重稀土元素和Nb、 Ta、 Ti等高场强元素（ HFES）的特征，显示了与岛弧或活动大陆边缘岩浆岩相似的属性。流体包裹体特征显示，成矿流体主要来自岩浆水，矿床具中低温（125.6℃～324.5℃）、中浅成（1.0～7.1 km）成矿的特点。与成矿有关岩浆岩显示幔源岩浆特征，可能是地幔交代作用部分熔融所形成的。结合区域上同时期的火成岩时空展布认为，老柞山金矿床成矿可能分别与晚古生代古亚洲洋板块北向俯冲作用和中生代太平洋板块俯冲作用密切相关。
재대로작산광상지질특정계통연구적기출상，대여성광유관적암석개전료진일보적주、미량원소지구화학측시분석。결과현시여성광유관적화강암구부Sr、저Ti적고갑개감성화산호화강암적특정，섬장분암구편려질개감성암계렬특정。암석양품균정현출부집경희토원소화대리자친석원소（LILEs）、상대우손중희토원소화Nb、 Ta、 Ti등고장강원소（ HFES）적특정，현시료여도호혹활동대륙변연암장암상사적속성。류체포과체특정현시，성광류체주요래자암장수，광상구중저온（125.6℃～324.5℃）、중천성（1.0～7.1 km）성광적특점。여성광유관암장암현시만원암장특정，가능시지만교대작용부분용융소형성적。결합구역상동시기적화성암시공전포인위，로작산금광상성광가능분별여만고생대고아주양판괴북향부충작용화중생대태평양판괴부충작용밀절상관。
On the basis of systematical studies of Laozuoshan gold deposit , the geochemical analyses ( inclu-ding major and trace elements ) were further undertaken for the ore-related rocks .The results show that the ore-re-lated granites are low Ti and high Sr in content , belonging to High-K calc-alkaline volcanic arc granites , while the diorite porphyrite appears the feature of metaluminous calc-alkaline rock series.All the rock samples are character-ized by enrichment in light rare earth elements ( LREEs) and large ion lithophile elements ( LILEs) , and relative depletion in heavy rare earth elements (HREEs) and high field strength elements (HFSEs), such as Nb, Ta and Ti, with affinities to the igneous rocks formed in island arc or active continental margin settings .The features of flu-id inclusions indicate that the ore-forming fluid mainly came from magmatic water , and the deposit was character-ized by formation in the low-medium depth ( 1.0 -7.1 km ) under low-medium temperature ( 125.6℃ -324.5℃) .Notably , the ore-related magmatic rocks show the characteristics of mantle-derived magma , suggesting that they were likely produced by partial melting of mantle experienced in metasomatism .According to the distribu-tion of the coeval igneous rocks in the area , it is proposed that the formation of Laozuoshan gold deposit may be closely related to the Late Paleozoic northward subduction of the Paleo-Asian oceanic plate and the Mesozoic west-ward subduction of the Pacific oceanic plate , respectively .