摘要
本文综合了玉龙斑岩铜矿带花岗岩类的K-Ar年龄数据,首次提供了Rb-Sr等时线、^(39)Ar-^(40)Ar全熔融法和U-Pb等时线年龄,确证岩浆侵入时代在早第三纪始新世至渐新世期间,且可划分为早(52.0±2.8Ma)、中(40.1±1.3Ma)、晚(33.2±1.3Ma)三期。
Presented in this paper are new 40Ar-39Ar, whole-rock monomineral Rb-Sr isochron and zircon U-Pb isochron ages of magma emplacement in the Yulong porphyry copper belt, eastern Tibet. These data show satisfactory consistency with K-Ar ages cited from the literature. It is concluded from the available isotope data that the emplacement of mineralizing magmas started from Eocene to Oligocene (early stage of the Himalayan movement), and can be divided into three episodes: early (52.0 ± 2.8 Ma), middle (40.1 ± 1.3 Ma), and late (33.2 ± 1.3 Ma). It is evident from the available chronological data that the major mineralized porphyry stocks are probobly composite complexes derived from multi-stage magmatic intrusions, and the re-serves of copper in the mineralized stocks tend to decrease with the emplacement age changing from old to young.
出处
《地球化学》
CAS
CSCD
北大核心
1989年第3期210-216,共7页
Geochimica
