Petrology and geochemistry of Late Triassic rapakivi-type granites in the Dupangling area, South China: Role of fluid-rock interaction in the origin of rapakivi texture
文献类型：期刊论文
| 作者 | Zhao, Qian -Qian5; Pang, Chong-Jin4,5; Wen, Shu-Nv5; Wang, Xuan-Ce1; Huang, Xiao-Long3,4; Krapez, Bryan5; Luo, Xian-Sheng5; Bai, Ling -An5; Dai, Yu2 |
| 刊名 | LITHOS
 |
| 出版日期 | 2023-12-01 |
| 卷号 | 460页码:17 |
| 关键词 | Dupangling pluton Late Triassic Rapakivi feldspar Subsolidus dissolution-reprecipitation replace-ment Fluid-rock interaction South China |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2023.107365 |
| 英文摘要 | Rapakivi-type granites not only document magmatic processes but also archive subsolidus interactions between granitic rock and fluid, and thereby provide crucial information about fluid infiltration in the Earth's crust. However, the key process to generate rapakivi texture is still debated. Here, we report comprehensive mineralogical, geochemical and Hf isotopic compositions of the Dupangling rapakivi granites (210.4-214.9 Ma) in the South China Block to investigate the effect of fluid-rock interaction on the origin of rapakivi feldspar. Dupangling rapakivi granites have high SiO2 (72.63-78.21 wt%) and alkali contents (Na2O + K2O = 6.14-9.06 wt%) with high K2O/Na2O ratios (1.37-2.64), characteristic of weakly peraluminous (A/CNK = 1.04-1.10) high-K calcalkaline granites. Samples have weakly fractionated REE patterns with negative Eu anomalies (delta Eu = 0.05-0.38). They have negative whole-rock epsilon Nd(t) (-8.45 to -7.91), variable zircon epsilon Hf(t) (-9.7 to -1.0) and two-stage Hf isotope model ages (1.32-1.84 Ga), due to their derivation from a major early Mesoproterozoic crustal source with a subordinate late Paleoproterozoic component. Rapakivi feldspars in Dupangling granites are composed of an alkali-feldspar core and a plagioclase mantle. Fractures, pores and secondary inclusions (biotite, sericite, epidote and hematite) are closely associated with the mantles and oligoclase patches within alkali-feldspar cores. These pervasive microtextural features and variations of Be, Rb, Ba, Sr and LREE within rapakivi feldspars are interpreted to have formed through subsolidus fluid-induced dissolution-reprecipitation replacement processes. This study highlights that fluid-rock interaction plays an important role in generating rapakivi texture. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001087108400001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78740]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Wen, Shu-Nv |
| 作者单位 | 1.Yunnan Univ, Sch Earth Sci, Kunming 650500, Peoples R China 2.Guangxi Inst Reg Geol Survey, Guilin 541003, Peoples R China 3.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 4.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, Peoples R China 5.Guilin Univ Technol, Collaborat Innovat Ctr Explorat Nonferrous Met Dep, Guangxi Key Lab Hidden Met Ore Deposits Explorat, Guilin 541004, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Qian -Qian,Pang, Chong-Jin,Wen, Shu-Nv,et al. Petrology and geochemistry of Late Triassic rapakivi-type granites in the Dupangling area, South China: Role of fluid-rock interaction in the origin of rapakivi texture[J]. LITHOS,2023,460:17. |
| APA | Zhao, Qian -Qian.,Pang, Chong-Jin.,Wen, Shu-Nv.,Wang, Xuan-Ce.,Huang, Xiao-Long.,...&Dai, Yu.(2023).Petrology and geochemistry of Late Triassic rapakivi-type granites in the Dupangling area, South China: Role of fluid-rock interaction in the origin of rapakivi texture.LITHOS,460,17. |
| MLA | Zhao, Qian -Qian,et al."Petrology and geochemistry of Late Triassic rapakivi-type granites in the Dupangling area, South China: Role of fluid-rock interaction in the origin of rapakivi texture".LITHOS 460(2023):17. |
入库方式： OAI收割
来源：广州地球化学研究所
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