Magma generation and sulfide saturation of Permian mafic-ultramafic intrusions from the western part of the Northern Tianshan in NW China: implications for Ni-Cu mineralization

Yu Feng Deng, Feng Yuan, Peter Hollings, Xie Yan Song, Taofa Zhou, Bin Fu, Steven Denyszyn, Bingbing Zhao

Research output: Contribution to journalArticle

Abstract

Compared to Permian magmatic Ni-Cu sulfide deposits in the eastern part of the Northern Tianshan, such as Huangshan and Huangshandong, those in the western part (e.g., Baixintan and Lubei) are poorly documented. Zircon ID-TIMS U-Pb age data (279.7 ± 0.2 Ma) of lherzolite and LA-ICPMS U-Pb age data (277.8 ± 3.4 Ma) of a hornblende gabbro suggest the Lubei intrusion was emplaced in the Early Permian. The Baixintan and Lubei mafic-ultramafic intrusive rocks are characterized by enrichments of large ion lithophile elements and Th and U relative to the high field strength elements, as well as depletion of Nb and Ta relative to mid-ocean ridge basalt. The (87Sr/86Sr)t (0.70354–0.70713), εNd(t) (2.80 to + 7.05), and εHf(t) (2.50–18.4) values for the intrusions indicate that they have assimilated Tianshan basement rocks, whereas the Se/S ratios (181 × 10−6–418 × 10−6) and δ34SCDT values (− 0.13‰ to 0.90‰) of the sulfides suggest that crustal sulfur has not been incorporated into the magma. The decrease in Pd/Zr with increasing (Th/Nb)PM indicates that sulfide saturation accompanied crustal contamination. The olivine compositions and whole-rock chalcophile elements of the Baixintan and Lubei intrusions imply that the parental magma of the intrusive rocks in the west contains higher chalcophile elements than those in the east, which suggests that the mafic-ultramafic intrusions in the western part of the Northern Tianshan should be regarded as favorable Ni-Cu sulfide exploration targets.

Original languageEnglish
JournalMineralium Deposita
DOIs
Publication statusE-pub ahead of print - 28 May 2019

Fingerprint

Sulfides
intrusion
magma
sulfides
China
Permian
Rocks
sulfide
saturation
rocks
mineralization
gabbro
mid-ocean ridges
crustal contamination
lherzolite
ultramafic rock
basement rock
mafic rock
Heavy ions
basements

Cite this

@article{ecb74051945b4ea88d5a31d0543184f7,
title = "Magma generation and sulfide saturation of Permian mafic-ultramafic intrusions from the western part of the Northern Tianshan in NW China: implications for Ni-Cu mineralization",
abstract = "Compared to Permian magmatic Ni-Cu sulfide deposits in the eastern part of the Northern Tianshan, such as Huangshan and Huangshandong, those in the western part (e.g., Baixintan and Lubei) are poorly documented. Zircon ID-TIMS U-Pb age data (279.7 ± 0.2 Ma) of lherzolite and LA-ICPMS U-Pb age data (277.8 ± 3.4 Ma) of a hornblende gabbro suggest the Lubei intrusion was emplaced in the Early Permian. The Baixintan and Lubei mafic-ultramafic intrusive rocks are characterized by enrichments of large ion lithophile elements and Th and U relative to the high field strength elements, as well as depletion of Nb and Ta relative to mid-ocean ridge basalt. The (87Sr/86Sr)t (0.70354–0.70713), εNd(t) (2.80 to + 7.05), and εHf(t) (2.50–18.4) values for the intrusions indicate that they have assimilated Tianshan basement rocks, whereas the Se/S ratios (181 × 10−6–418 × 10−6) and δ34SCDT values (− 0.13‰ to 0.90‰) of the sulfides suggest that crustal sulfur has not been incorporated into the magma. The decrease in Pd/Zr with increasing (Th/Nb)PM indicates that sulfide saturation accompanied crustal contamination. The olivine compositions and whole-rock chalcophile elements of the Baixintan and Lubei intrusions imply that the parental magma of the intrusive rocks in the west contains higher chalcophile elements than those in the east, which suggests that the mafic-ultramafic intrusions in the western part of the Northern Tianshan should be regarded as favorable Ni-Cu sulfide exploration targets.",
keywords = "Baixintan mafic-ultramafic intrusion, Lubei mafic-ultramafic intrusion, Magmatic Ni-Cu sulfide deposit, Mantle source, Sulfide saturation, Western Northern Tianshan",
author = "Deng, {Yu Feng} and Feng Yuan and Peter Hollings and Song, {Xie Yan} and Taofa Zhou and Bin Fu and Steven Denyszyn and Bingbing Zhao",
year = "2019",
month = "5",
day = "28",
doi = "10.1007/s00126-019-00890-8",
language = "English",
journal = "Mineralium Deposita: international journal of geology, mineralogy, and geochemistry of mineral deposits",
issn = "0026-4598",
publisher = "Springer-Verlag London Ltd.",

}

Magma generation and sulfide saturation of Permian mafic-ultramafic intrusions from the western part of the Northern Tianshan in NW China : implications for Ni-Cu mineralization. / Deng, Yu Feng; Yuan, Feng; Hollings, Peter; Song, Xie Yan; Zhou, Taofa; Fu, Bin; Denyszyn, Steven; Zhao, Bingbing.

In: Mineralium Deposita, 28.05.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Magma generation and sulfide saturation of Permian mafic-ultramafic intrusions from the western part of the Northern Tianshan in NW China

T2 - implications for Ni-Cu mineralization

AU - Deng, Yu Feng

AU - Yuan, Feng

AU - Hollings, Peter

AU - Song, Xie Yan

AU - Zhou, Taofa

AU - Fu, Bin

AU - Denyszyn, Steven

AU - Zhao, Bingbing

PY - 2019/5/28

Y1 - 2019/5/28

N2 - Compared to Permian magmatic Ni-Cu sulfide deposits in the eastern part of the Northern Tianshan, such as Huangshan and Huangshandong, those in the western part (e.g., Baixintan and Lubei) are poorly documented. Zircon ID-TIMS U-Pb age data (279.7 ± 0.2 Ma) of lherzolite and LA-ICPMS U-Pb age data (277.8 ± 3.4 Ma) of a hornblende gabbro suggest the Lubei intrusion was emplaced in the Early Permian. The Baixintan and Lubei mafic-ultramafic intrusive rocks are characterized by enrichments of large ion lithophile elements and Th and U relative to the high field strength elements, as well as depletion of Nb and Ta relative to mid-ocean ridge basalt. The (87Sr/86Sr)t (0.70354–0.70713), εNd(t) (2.80 to + 7.05), and εHf(t) (2.50–18.4) values for the intrusions indicate that they have assimilated Tianshan basement rocks, whereas the Se/S ratios (181 × 10−6–418 × 10−6) and δ34SCDT values (− 0.13‰ to 0.90‰) of the sulfides suggest that crustal sulfur has not been incorporated into the magma. The decrease in Pd/Zr with increasing (Th/Nb)PM indicates that sulfide saturation accompanied crustal contamination. The olivine compositions and whole-rock chalcophile elements of the Baixintan and Lubei intrusions imply that the parental magma of the intrusive rocks in the west contains higher chalcophile elements than those in the east, which suggests that the mafic-ultramafic intrusions in the western part of the Northern Tianshan should be regarded as favorable Ni-Cu sulfide exploration targets.

AB - Compared to Permian magmatic Ni-Cu sulfide deposits in the eastern part of the Northern Tianshan, such as Huangshan and Huangshandong, those in the western part (e.g., Baixintan and Lubei) are poorly documented. Zircon ID-TIMS U-Pb age data (279.7 ± 0.2 Ma) of lherzolite and LA-ICPMS U-Pb age data (277.8 ± 3.4 Ma) of a hornblende gabbro suggest the Lubei intrusion was emplaced in the Early Permian. The Baixintan and Lubei mafic-ultramafic intrusive rocks are characterized by enrichments of large ion lithophile elements and Th and U relative to the high field strength elements, as well as depletion of Nb and Ta relative to mid-ocean ridge basalt. The (87Sr/86Sr)t (0.70354–0.70713), εNd(t) (2.80 to + 7.05), and εHf(t) (2.50–18.4) values for the intrusions indicate that they have assimilated Tianshan basement rocks, whereas the Se/S ratios (181 × 10−6–418 × 10−6) and δ34SCDT values (− 0.13‰ to 0.90‰) of the sulfides suggest that crustal sulfur has not been incorporated into the magma. The decrease in Pd/Zr with increasing (Th/Nb)PM indicates that sulfide saturation accompanied crustal contamination. The olivine compositions and whole-rock chalcophile elements of the Baixintan and Lubei intrusions imply that the parental magma of the intrusive rocks in the west contains higher chalcophile elements than those in the east, which suggests that the mafic-ultramafic intrusions in the western part of the Northern Tianshan should be regarded as favorable Ni-Cu sulfide exploration targets.

KW - Baixintan mafic-ultramafic intrusion

KW - Lubei mafic-ultramafic intrusion

KW - Magmatic Ni-Cu sulfide deposit

KW - Mantle source

KW - Sulfide saturation

KW - Western Northern Tianshan

UR - http://www.scopus.com/inward/record.url?scp=85066502156&partnerID=8YFLogxK

U2 - 10.1007/s00126-019-00890-8

DO - 10.1007/s00126-019-00890-8

M3 - Article

JO - Mineralium Deposita: international journal of geology, mineralogy, and geochemistry of mineral deposits

JF - Mineralium Deposita: international journal of geology, mineralogy, and geochemistry of mineral deposits

SN - 0026-4598

ER -