现代地质
現代地質
현대지질
GEOSCIENCE-JOURNAL OF GRADUATE SCHOOL CHINA UNIVERSITY OF GEOSCIENCES
2009年
6期
1049-1055
,共7页
李峰%鲁文举%杨映忠%陈珲%罗思亮%石增龙
李峰%魯文舉%楊映忠%陳琿%囉思亮%石增龍
리봉%로문거%양영충%진혼%라사량%석증룡
斑岩钼矿%成岩成矿年龄%锆石SHRIMP U-Pb法%辉钼矿Re-Os定年法%澜沧老厂%云南
斑巖鉬礦%成巖成礦年齡%鋯石SHRIMP U-Pb法%輝鉬礦Re-Os定年法%瀾滄老廠%雲南
반암목광%성암성광년령%고석SHRIMP U-Pb법%휘목광Re-Os정년법%란창로엄%운남
porphyry molybdenum deposit%rock-and ore-forming ages%SHRIMP zircon U-Pb dating%molybdenite Re-Os dating method%Laochang in Lancang%Yunnan
2008年以来,滇西澜沧老厂矿区深部新发现巨厚斑岩型钼矿体,找矿取得重大突破.在对矿区矿化系统结构研究的基础上,应用锆石SHRIMP U-Pb法和辉钼矿Re-Os同位素测年法对成岩和成矿进行精确定年.结果表明:成矿花岗斑岩体的形成年龄为(44.6±1.1)Ma;辉钼矿Re-Os等时线年龄为(43.78±0.78)Ma.证实矿区喜山期存在与隐伏花岗斑岩有关的大规模成矿作用,斑岩钼矿的成岩成矿期与滇西新生代岩浆作用高峰期吻合,老厂斑岩钼矿形成于陆内碰撞造山环境.
2008年以來,滇西瀾滄老廠礦區深部新髮現巨厚斑巖型鉬礦體,找礦取得重大突破.在對礦區礦化繫統結構研究的基礎上,應用鋯石SHRIMP U-Pb法和輝鉬礦Re-Os同位素測年法對成巖和成礦進行精確定年.結果錶明:成礦花崗斑巖體的形成年齡為(44.6±1.1)Ma;輝鉬礦Re-Os等時線年齡為(43.78±0.78)Ma.證實礦區喜山期存在與隱伏花崗斑巖有關的大規模成礦作用,斑巖鉬礦的成巖成礦期與滇西新生代巖漿作用高峰期吻閤,老廠斑巖鉬礦形成于陸內踫撞造山環境.
2008년이래,전서란창로엄광구심부신발현거후반암형목광체,조광취득중대돌파.재대광구광화계통결구연구적기출상,응용고석SHRIMP U-Pb법화휘목광Re-Os동위소측년법대성암화성광진행정학정년.결과표명:성광화강반암체적형성년령위(44.6±1.1)Ma;휘목광Re-Os등시선년령위(43.78±0.78)Ma.증실광구희산기존재여은복화강반암유관적대규모성광작용,반암목광적성암성광기여전서신생대암장작용고봉기문합,로엄반암목광형성우륙내팽당조산배경.
The Laochang region in western Yunnan is one of the areas with significant breakthrough for new discovery of great thick porphyry molybdenum ore bodies in the deep since 2008. On the basis of the analysis to mineralizing system texture, the rock- and ore-forming ages of the granite-porphyry and related molybdenum ores were precisely redefined by the SHRIMP zircon U-Pb and molybdenite Re-Os dating method. The results show that the age of ore-forming granite-porphyry is (44.6±1.1)Ma, and the Re-Os isochron of molybdenites is (43.78±0.78)Ma. It is suggested that a large-scale Mo(Cu)-mineralization exists in this region, which related to Himalayan concealed granite-porphyry,and consistent with the peak period of Cenozoic magmatism-mineralization in forming ages, and formed in intracontinental collision orogenic setting.