2D and 3D textures of sulfide ores from the Shitoukengde Ni-Cu sulfide deposit, East Kunlun Orogenic Belt, NW China: implications for the growth of orthopyroxene oikocrysts and formation of globular ores
文献类型：期刊论文
| 作者 | Wei, Bo1,3,4; Wang, Christina Yan1,3,4; Cao, Yonghua1,3,4; Wang, Jiangze2,3 |
| 刊名 | MINERALIUM DEPOSITA
 |
| 出版日期 | 2024-07-10 |
| 页码 | 16 |
| 关键词 | 3D morphology Poikilitic texture Orthopyroxene oikocrysts Globular ores Shitoukengde Ni-Cu sulfide deposit |
| ISSN号 | 0026-4598 |
| DOI | 10.1007/s00126-024-01296-x |
| 英文摘要 | Orthopyroxene oikocrysts and globular ores are both observed in the Shitoukengde Ni-Cu sulfide deposit within the Eastern Kunlun Orogenic Belt in China. Through the utilization of microbeam X-ray fluorescence (micro-XRF) and electron probe micro-analyzer (EPMA) mapping techniques, complemented by 3D morphology analysis using high-resolution X-ray computed tomography (HRXCT), we conducted a comprehensive investigation into the 2D and 3D textures of orthopyroxene oikocrysts and globular ores in the Shitoukengde Ni-Cu sulfide deposit. The contents of orthopyroxene oikocrysts within the lherzolite gradually increases as it approaches the contact with coarse-grained orthopyroxenite. Both the orthopyroxene oikocrysts in the lherzolite and the cumulus orthopyroxene in the coarse-grained orthopyroxenite are centimeter-sized and contain corroded chadacrysts of olivine, exhibiting similar Cr-Al sector and oscillatory zoning. It indicates that the orthopyroxene oikocrysts rapidly grew in a dynamic and fluctuating magmatic environment, rather than in a static crystal mush. We propose that the orthopyroxene oikocrysts initially grew in a boundary layer between an olivine orthocumulate and an orthopyroxene-saturated magma. The orthopyroxene oikocrysts and olivine crystals were then entrained within a flowing magma and redeposited in their current location. Globular sulfides in the coarse-grained orthopyroxenite can reach sizes of up to one centimeter and are not accompanied by silicate caps. The particle size distribution (PSD) plots of the globular sulfides exhibit concave-up PSD curves, indicating that the larger sulfide droplets are likely formed through the coalescence of sulfide microdroplets. During postcumulus processes, the downward migration and coalescence of microdroplets within the interstitial framework of orthopyroxene cumulate lead to the formation of larger sulfide blebs. The coalesced sulfide blebs were then stranded in the pore spaces of the crystal mush due to the capillary effects, resulting in the formation of centimeter-sized globular sulfides. The morphology of coalesced sulfide droplets within orthopyroxene cumulate is influenced by the relative sizes of the sulfide blebs, pore bodies, and pore throats within the interstitial framework. This study proposed a cumulus origin for the orthopyroxene oikocrysts and highlights that the coarse-grained rocks facilitate the formation of the globular ores. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001268191300001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78279]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Wei, Bo |
| 作者单位 | 1.Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, CAS Key Lab Mineral & Metallogeny, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 4.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wei, Bo,Wang, Christina Yan,Cao, Yonghua,et al. 2D and 3D textures of sulfide ores from the Shitoukengde Ni-Cu sulfide deposit, East Kunlun Orogenic Belt, NW China: implications for the growth of orthopyroxene oikocrysts and formation of globular ores[J]. MINERALIUM DEPOSITA,2024:16. |
| APA | Wei, Bo,Wang, Christina Yan,Cao, Yonghua,&Wang, Jiangze.(2024).2D and 3D textures of sulfide ores from the Shitoukengde Ni-Cu sulfide deposit, East Kunlun Orogenic Belt, NW China: implications for the growth of orthopyroxene oikocrysts and formation of globular ores.MINERALIUM DEPOSITA,16. |
| MLA | Wei, Bo,et al."2D and 3D textures of sulfide ores from the Shitoukengde Ni-Cu sulfide deposit, East Kunlun Orogenic Belt, NW China: implications for the growth of orthopyroxene oikocrysts and formation of globular ores".MINERALIUM DEPOSITA (2024):16. |
入库方式： OAI收割
来源：广州地球化学研究所
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