• 责任者：Ren Minghao (State Key Laboratory of Isotope Geochemistry ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Wang Yan
• 刊名：Acta Petrologica Sinica
• 出版年：2013
• 卷期：29(10)
• 关键词：超镁铁质岩 ; ultramafics ; 镁铁质成分 ; mafic composition ; 天山 ; Tianshan Mountains
• 页码：p.3473-3486
• 图表：11 illus., 4 tables, 44 refs.
• 分类号：0801
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

mal" style="margin: 0cm 0cm 0pt">
     The No. 1 and No. 2 mafic-uhramafic intrusions in the Dacaotan area located in the middle of Jueluotag suture zone and north of Kanggnertage-Huangshan fault. To the east of this area, a number of magmatic Ni-Cu-（PGE） sulfide deposits are hosted in the mafic and ultramafic intrusions in the Tudun-Huangshan-Tulargen areas, which occur in the south of Kanggnertage-Huangshan fault. Zircons from two gabbro samples of the No. 1 and No. 2 intrusions yield SIMS ^238206ges of 279± 2Ma and 278 ± 2Ma, respectively. The two intrusions mainly consist of dunite and gabbro and both have low rare earth elements （REE） concentrations, with slightly depleted to fiat LREE patterns. Whole-rock Sr-Nd isotopic compositions indicate that the parental magmas of the two intrusions may have derived from asthenosphere mantle and were similar to N-MORB in compositions. The parental magmas may have been contaminated by small amounts （1% ～% ） of the coeval A-type granite during ascent. Due to relatively low degrees of partial melting of the mantle source （ 10% ～15% ）, sulfides may be remained in the mantle source. The parental magmas therefore are PGE-depleted and it is little chance to find economic Ni-Cu-（PGE） sulfide deposits in these two intrusions.