Geochemical characteristics and magma fertility for the Jurassic arc rocks in the Gangdese belt, Tibet

Chen, Xilian; Liang, Huaying; Zhang, Jian; Sotiriou, Paul; Huang, Wenting; Ren, Long; Le, Zhang; Zou, Yinqiao

doi:10.1016/j.oregeorev.2019.103169

Cited by 15 publications

(4 citation statements)

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“…However, Wu et al () suggested that the remnant ophiolites in the Yarlung‐Tsangpo suture could not represent a remnant of the Neo‐Tethyan Ocean, because they formed at an ultra‐slow spreading center. Recently, more occurrences of Late Triassic‐Jurassic magmatic rocks (including intrusions and volcanic rocks like the Bima Formation and the Yeba Formation) are reported in the Gangdese Belt, forming a ~600 km long E‐W‐trending Late Triassic‐Jurassic magmatic belt (e.g., Chen et al, , b; Chu et al, ; Guo et al, ; Ji, Wu, Chung et al, ; Ji, Wu, Liu, et al, ; Kang et al, ; Song et al, ). These rocks are most characterized by arc‐related geochemical features and with depleted Sr‐Nd‐Hf isotopes.…”

Section: Discussionmentioning

confidence: 99%

“…Magma oxidation state and volatile contents (including water, sulfur, fluorine and chlorine contents) are vital for the formation of porphyry Cu deposit (Chen et al, , b; Liang et al, ; Liang, Sun, Su, & Zartman, ; Huang et al, , ; Richards, , ; Richards & Şengör, ; Sun et al, ; Wang, Richards, Hou, Yang, & Dufrane, ; Wang, Richards, Hou, Yang, Gou, et al, ; Zou et al, ), therefore, it is important to know these features before evaluation the genetic type of the porphyry Cu deposit (oxidized or reduced).…”

Section: Discussionmentioning

confidence: 99%

“…Many processes control the formation of porphyry Cu deposits, from the generation of fertile parent magma to magmatic‐hydrothermal fluid evolution process, and only optimization of these processes can form large deposits (Cooke, ; Richards, , , ). The only known subduction‐related porphyry Cu–Au deposit (Xietongmen porphyry Cu–Au deposit) in the Gangdese Belt is probably due to the inefficient processes mentioned above, or subsequent erosion and/or lack of exploration (Chen, Liang, et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…I and No. II ore‐bearing porphyries, and therefore fertile for the subduction‐related porphyry Cu–Au deposits (Chen et al, , b). Many processes control the formation of porphyry Cu deposits, from the generation of fertile parent magma to magmatic‐hydrothermal fluid evolution process, and only optimization of these processes can form large deposits (Cooke, ; Richards, , , ).…”

Section: Discussionmentioning

confidence: 99%

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Geochemical characteristics and oxidation states of the Xietongmen ore‐bearing porphyries: Implication for the genetic types of the Xietongmen No. I and No. II deposits, southern Tibet

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The Xietongmen large deposit is the only known subduction-related porphyry Cu deposit in the Gangdese Belt, Tibet, which is composed of the No. I and No. II deposits. Previous work suggests that the No. I deposit is reduced while the No. II deposit is oxidized. However, it is ambiguous that both oxidized and reduced porphyry Cu deposits occur in close proximity, in the same tectonic setting, and within a short time period. Detailed examination of the ages, whole-rock geochemistry, zircon and apatite compositions of the Xietongmen No. I and No. II ore-bearing porphyries are conducted to investigate their magma characteristics and the genetic types of the Xietongmen No. I and No. II deposits. Zircon U-Pb dating results show that the Xietongmen No. I and No. II ore-bearing porphyries formed at 166.3 ± 2.6 Ma and 175.5 ± 1.0 Ma, respectively. The Xietongmen No. I and No. II ore-bearing porphyries have similar mineral assemblage (containing amphibole phenocryst), high Sr/Y ratios and negligible negative Eu anomalies, low Ti-in-zircon temperatures (633−749 and 633−763 C, respectively), which indicate that their magmas are water-rich. In addition, the Xietongmen No. I and No. II ore-bearing porphyries have: (a) high wholerock V/Sc ratios (10−15 and 8−16, respectively); (b) high zircon Ce 4+ /Ce 3+ and Eu N / Eu N * ratios, falling into the field of the ore-bearing intrusions in northern Chile; (c) low apatite Ce N /Ce N * ratios (0.97−1.02 and 0.99−1.02, respectively), which suggest that their magmas are oxidized. The estimated magmatic S contents, based on the magmatic apatite SO 3 contents, yield 0.0113−0.0507 wt% and 0.0012 −0.0118 wt%, respectively for the Xietongmen No. I and No. II ore-bearing porphyries, which suggest their magma are sulfur-rich. Hydrous, oxidized and sulfur-rich magmas are the parent magma of oxidized porphyry Cu deposits, together with the oxidized minerals of hematite and magnetite, therefore, both Xietongmen No. I and No. II deposit are oxidized porphyry Cu deposits, rather than that the Xietongmen No. I deposit is a reduced porphyry Cu deposit. K E Y W O R D S porphyry Cu deposit, zircon, apatite, oxidation state, Xietongmen

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