桂林理工大学学报2018，Vol.38Issue(4)：680-687,8.DOI:10.3969/j.issn.1674-9057.2018.04.009
古特提斯与峨眉山地幔柱相互作用:来自桂西那坡地区基性岩铂族元素地球化学特征
Interaction between Paleo-Tethys and Emeishan mantle plume: evidence from platinum group element geochemistry of the Napomafic rock, western Guangxi
摘要
Abstract
Geochemistry study of platinum group element(PGE) was carried out on the Napo basic rock in western Guangxi,and compared with the basalt in ELIP to reveal the genesis and evolution of the basic rock. The PGE contents of the Napo high-Ti mafic rock and low-Ti mafic rock are quite different,high-Ti mafic rock is relatively rich in PGE(respectively,Ir (0. 063 - 0. 079) × 10 - 9,Ru (0. 047 - 0. 054) × 10 - 9,Rh (0. 153 - 0. 173) × 10 - 9,Pt(4. 183 - 4. 343) × 10 - 9,Pd(2. 7 - 2. 91) × 10 - 9) whereas low-Ti mafic rock is extremely poor in PGE(respectively,Ir(0. 005 - 0. 014) × 10 - 9,Ru(0. 008 - 0. 013) × 10 - 9,Rh(0. 003 - 0. 013) × 10 - 9,Pt(0. 064 - 0. 364) × 10 - 9,Pd(0. 055 - 0. 281) × 10 - 9) . The results show that the primitive mantle normalized PGE patterns of Napo high-Ti mafic rock are similar to ELIP,and basalts with low Cu /Pd and high Pt /Y ratios when compared to Napo low-Ti mafic rock. However,Napo low-Ti mafic rock displays a different primitive mantle normalized PGE patterns and lower PGE abundance and Pt /Y ratios,importantly with extremely high Cu /Pd ratios when compared to Napo high-Ti mafic rock and ELIP basalts. These features suggest that Napo high-Ti mafic rock inherited the feature of the Emeishan mantle plume source,but distinctive PGE characteristics of the Napo low-Ti mafic rock indicate that they may be co-affected by Paleo-Tethys subduction system and Emeishan mantle plume and formed by interaction between Emeishan mantle plume and Paleo-Tethys asthenosphere mantle.关键词
铂族元素/基性岩/ELIP/古特提斯/桂西Key words
platinum-group elements/mafic rock/ELIP/Paleo-Tethys/western Guangxi!分类
天文与地球科学引用本文复制引用
招传,丁姗姗,刘希军,时毓,刘磊,李政林,潘罗忠,胡荣国,王葆华,张治国..古特提斯与峨眉山地幔柱相互作用:来自桂西那坡地区基性岩铂族元素地球化学特征[J].桂林理工大学学报,2018,38(4):680-687,8.基金项目
国家自然科学基金项目(41463002) （41463002）
广西自然科学基金杰出青年科学基金项目(2018GXNSFFA281009) （2018GXNSFFA281009）
广西自然科学基金项目(2017GXNSFBA198167) （2017GXNSFBA198167）
广西研究生教育创新计划项目(YCSW2018151) （YCSW2018151）
