Origin of composite Ni-Cu sulfide- and Fe-Ti oxide-bearing mafic-ultramafic intrusions in the Central Asian Orogenic Belt, China: Role of externally derived crustal organic carbon in controlling mineralization of post-collisional mafic magmatism
文献类型：期刊论文
| 作者 | Cao, Yonghua2,3,4; Wang, Christina Yan1,2,3; Wei, Bo1,2,3 |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2024-05-01 |
| 卷号 | 136期号:5-6页码:2407-2424 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36851.1 |
| 英文摘要 | Composite Ni-Cu sulfideand Fe -Ti oxidebearing mafic-ultramafic intrusions have been discovered in convergent margin settings worldwide, but their origins remain enigmatic. Permian Kebu mafic-ultramafic intrusion in the Central Asian Orogenic Belt hosts both Ni-Cu sulfide and Fe -Ti oxide mineralization and formed in a post-collisional, Andean -style arc setting. The Ni-Cu sulfideand Fe -Ti oxide -bearing rocks in the intrusion have similarly arc -like trace element patterns on the primitive mantle-normalized trace element diagram and negative epsilon Nd (t) values ( - 16 to - 5), which indicate that the parental magma of the intrusion may have been derived from the enriched, metasomatized lithospheric mantle. The magma oxygen fugacity ( f O 2 ) was calculated to be FMQ + 1.3 similar to FMQ + 2.0, which can be attributed to the evolution of hydrated parental magma derived from the metasomatized lithospheric mantle. Also, the rocks all have negative delta 13 C values ( - 28.5 parts per thousand to - 20 parts per thousand), which indicates incorporation of externalderived crustal organic carbon into magmas. However, the Ni-Cu sulfide -bearing rocks contain more high -temperature carbon than the Fe -Ti oxide -bearing rocks. Modeling results based on alphaMELTS show that the magmas forming the Ni-Cu sulfide -bearing rocks may have assimilated more organic carbon than those that formed the Fe -Ti oxide -bearing rocks. Based on the estimated amounts of organic carbon in the two types of rocks, we deduced that initially oxidized magma pulses may have been reduced in variable degrees, leading to the formation of composite Ni-Cu sulfide and Fe -Ti oxide mineralization in one intrusive body. Mafic magmas in subduction-related, convergent margin settings are commonly highly oxidized due to metasomatism of the mantle wedge by slab -derived fluids/melts, and this may explain why the mafic-ultramafic intrusions associated with composite Ni-Cu sulfide and Fe -Ti oxide mineralization often occur in convergent margin settings. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001235338500003 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78513]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Wang, Christina Yan |
| 作者单位 | 1.Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510460, Peoples R China 4.Cent South Univ, Sch Geosci & Info Phys, Key Lab Metallogen Predict Nonferrous Met & Geol E, Minist Educ, Changsha 410083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cao, Yonghua,Wang, Christina Yan,Wei, Bo. Origin of composite Ni-Cu sulfide- and Fe-Ti oxide-bearing mafic-ultramafic intrusions in the Central Asian Orogenic Belt, China: Role of externally derived crustal organic carbon in controlling mineralization of post-collisional mafic magmatism[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2024,136(5-6):2407-2424. |
| APA | Cao, Yonghua,Wang, Christina Yan,&Wei, Bo.(2024).Origin of composite Ni-Cu sulfide- and Fe-Ti oxide-bearing mafic-ultramafic intrusions in the Central Asian Orogenic Belt, China: Role of externally derived crustal organic carbon in controlling mineralization of post-collisional mafic magmatism.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,136(5-6),2407-2424. |
| MLA | Cao, Yonghua,et al."Origin of composite Ni-Cu sulfide- and Fe-Ti oxide-bearing mafic-ultramafic intrusions in the Central Asian Orogenic Belt, China: Role of externally derived crustal organic carbon in controlling mineralization of post-collisional mafic magmatism".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 136.5-6(2024):2407-2424. |
入库方式： OAI收割
来源：广州地球化学研究所
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