中祁连西段野马山岩基年代学、地球化学特征及地质意义

Zeng Bao Huang; Jian Ping Zheng; Bao Hua Li; Zhi Jun Wei; Wei Qi; Xu Chen

中祁连西段野马山岩基年代学、地球化学特征及地质意义

Translated title of the contribution: Geochronology and geochemistry of Yemashan batholiths in western Central Qilian and its tectonic implications

Zeng Bao Huang, Jian Ping Zheng, Bao Hua Li, Zhi Jun Wei, Wei Qi, Xu Chen

Research output: Contribution to journal › Article

19 Citations (Scopus)

Abstract

Located in western Central Qilian Mountain, the Yemashan batholiths are composed of early pluton (granodiorite and porphyritic monzogranite) and late pluton (monzogranite). U-Pb age determination of zircon by LA-ICPMS shows that the early pluton of Yemashan batholiths was intruded at (469.0±1.3) Ma, and the late pluton was intruded at (450.0±1.0) Ma. Compositionally, the early pluton of Yemashan batholiths has SiO₂ values ranging from 59.8% to 64.2%, K₂O/Na₂O ratios higher than 1, and molar A/NKC ratios from 0.8 to 1.0, indicating typical metaluminous granitoid. The pluton is depleted in Ba, Nb, Ta, Sr, P and Ti, and enriched in Rb, U and Th, and has total REE content ranging from 97.73 × 10^-6 to 185.76×10^-6, (La/Yb)_N from 5.57 to 12.47, and LREE/HREE from 7.7 to 11.3. The chondrite-normalized REE patterns of the pluton exhibit enrichment of LREE and depletion of HREE, with moderate negative Eu anomalies (δEu=0.66-0.89). The late pluton of Yemashan batholiths has SiO₂ ranging from 69.8% to 76.5%, K₂O/Na₂O from 1.2 to 1.7, and molar A/NKC from 0.8 to 1.0, implying weakly peraluminous granitoid. It also shows enrichment of Rb, U and Th, and depletion of Ba, Nb, Ta, Sr, P and Ti, with ∑REE from 78.97×10^-6 to 244.92×10^-6, and (La/ Yb)_N from 5.57 to 12.47. The chondrite-normalized REE patterns of the pluton exhibit enrichment of LREE and depletion of HREE, with pronounced negative Eu anomalies (δEu=0.11-0.24). The petrological and geochemical characteristics indicate that the early pluton of Yemashan batholiths could represent typical I-type granite formed in a subduction orogenic setting. The late pluton should be assigned to highly fractionated I-type granite formed in a post-collisional orogenic setting. On the basis of these features in combination with the tectonic locations of granite occurrence and field observation data, the authors hold that southward and northward subductions of the North Qilian oceanic plate took place in the Early Paleozoic, during which the southward subduction and collision resulted in the formation of Yemashan batholiths.

Translated title of the contribution	Geochronology and geochemistry of Yemashan batholiths in western Central Qilian and its tectonic implications
Original language	Chinese
Pages (from-to)	406-420
Number of pages	15
Journal	Geology in China
Volume	42
Issue number	2
Publication status	Published - Apr 2015
Externally published	Yes

Bibliographical note

Transliterated article title: "zhōng qí lián xī duàn yě mǎ shān yán jī nián dài xué 、 dì qiú huà xué tè zhēng jí dì zhì yì yì"

Keywords

Central Qilian
LA-ICPMS zircon U-Pb dating
double subduction
Yemashan batholiths

Cite this

@article{9dd02ff4d0fd4be4947dc0cd97a52dda,

title = "中祁连西段野马山岩基年代学、地球化学特征及地质意义",

abstract = "Located in western Central Qilian Mountain, the Yemashan batholiths are composed of early pluton (granodiorite and porphyritic monzogranite) and late pluton (monzogranite). U-Pb age determination of zircon by LA-ICPMS shows that the early pluton of Yemashan batholiths was intruded at (469.0±1.3) Ma, and the late pluton was intruded at (450.0±1.0) Ma. Compositionally, the early pluton of Yemashan batholiths has SiO2 values ranging from 59.8% to 64.2%, K2O/Na2O ratios higher than 1, and molar A/NKC ratios from 0.8 to 1.0, indicating typical metaluminous granitoid. The pluton is depleted in Ba, Nb, Ta, Sr, P and Ti, and enriched in Rb, U and Th, and has total REE content ranging from 97.73 × 10-6 to 185.76×10-6, (La/Yb)N from 5.57 to 12.47, and LREE/HREE from 7.7 to 11.3. The chondrite-normalized REE patterns of the pluton exhibit enrichment of LREE and depletion of HREE, with moderate negative Eu anomalies (δEu=0.66-0.89). The late pluton of Yemashan batholiths has SiO2 ranging from 69.8% to 76.5%, K2O/Na2O from 1.2 to 1.7, and molar A/NKC from 0.8 to 1.0, implying weakly peraluminous granitoid. It also shows enrichment of Rb, U and Th, and depletion of Ba, Nb, Ta, Sr, P and Ti, with ∑REE from 78.97×10-6 to 244.92×10-6, and (La/ Yb)N from 5.57 to 12.47. The chondrite-normalized REE patterns of the pluton exhibit enrichment of LREE and depletion of HREE, with pronounced negative Eu anomalies (δEu=0.11-0.24). The petrological and geochemical characteristics indicate that the early pluton of Yemashan batholiths could represent typical I-type granite formed in a subduction orogenic setting. The late pluton should be assigned to highly fractionated I-type granite formed in a post-collisional orogenic setting. On the basis of these features in combination with the tectonic locations of granite occurrence and field observation data, the authors hold that southward and northward subductions of the North Qilian oceanic plate took place in the Early Paleozoic, during which the southward subduction and collision resulted in the formation of Yemashan batholiths.",

keywords = "Central Qilian, LA-ICPMS zircon U-Pb dating, double subduction, Yemashan batholiths",

author = "Huang, {Zeng Bao} and Zheng, {Jian Ping} and Li, {Bao Hua} and Wei, {Zhi Jun} and Wei Qi and Xu Chen",

note = "Transliterated article title: {"}zhōng q{\'i} li{\'a}n xī du{\`a}n y{\v e} mǎ shān y{\'a}n jī ni{\'a}n d{\`a}i xu{\'e} 、 d{\`i} qi{\'u} hu{\`a} xu{\'e} t{\`e} zhēng j{\'i} d{\`i} zh{\`i} y{\`i} y{\`i}{"}",

year = "2015",

month = apr,

language = "Chinese",

volume = "42",

pages = "406--420",

journal = "Geology in China",

issn = "1000-3657",

publisher = "Editorial Board of Geology in China",

number = "2",

}

TY - JOUR

T1 - 中祁连西段野马山岩基年代学、地球化学特征及地质意义

AU - Huang, Zeng Bao

AU - Zheng, Jian Ping

AU - Li, Bao Hua

AU - Wei, Zhi Jun

AU - Qi, Wei

AU - Chen, Xu

N1 - Transliterated article title: "zhōng qí lián xī duàn yě mǎ shān yán jī nián dài xué 、 dì qiú huà xué tè zhēng jí dì zhì yì yì"

PY - 2015/4

Y1 - 2015/4

N2 - Located in western Central Qilian Mountain, the Yemashan batholiths are composed of early pluton (granodiorite and porphyritic monzogranite) and late pluton (monzogranite). U-Pb age determination of zircon by LA-ICPMS shows that the early pluton of Yemashan batholiths was intruded at (469.0±1.3) Ma, and the late pluton was intruded at (450.0±1.0) Ma. Compositionally, the early pluton of Yemashan batholiths has SiO2 values ranging from 59.8% to 64.2%, K2O/Na2O ratios higher than 1, and molar A/NKC ratios from 0.8 to 1.0, indicating typical metaluminous granitoid. The pluton is depleted in Ba, Nb, Ta, Sr, P and Ti, and enriched in Rb, U and Th, and has total REE content ranging from 97.73 × 10-6 to 185.76×10-6, (La/Yb)N from 5.57 to 12.47, and LREE/HREE from 7.7 to 11.3. The chondrite-normalized REE patterns of the pluton exhibit enrichment of LREE and depletion of HREE, with moderate negative Eu anomalies (δEu=0.66-0.89). The late pluton of Yemashan batholiths has SiO2 ranging from 69.8% to 76.5%, K2O/Na2O from 1.2 to 1.7, and molar A/NKC from 0.8 to 1.0, implying weakly peraluminous granitoid. It also shows enrichment of Rb, U and Th, and depletion of Ba, Nb, Ta, Sr, P and Ti, with ∑REE from 78.97×10-6 to 244.92×10-6, and (La/ Yb)N from 5.57 to 12.47. The chondrite-normalized REE patterns of the pluton exhibit enrichment of LREE and depletion of HREE, with pronounced negative Eu anomalies (δEu=0.11-0.24). The petrological and geochemical characteristics indicate that the early pluton of Yemashan batholiths could represent typical I-type granite formed in a subduction orogenic setting. The late pluton should be assigned to highly fractionated I-type granite formed in a post-collisional orogenic setting. On the basis of these features in combination with the tectonic locations of granite occurrence and field observation data, the authors hold that southward and northward subductions of the North Qilian oceanic plate took place in the Early Paleozoic, during which the southward subduction and collision resulted in the formation of Yemashan batholiths.

AB - Located in western Central Qilian Mountain, the Yemashan batholiths are composed of early pluton (granodiorite and porphyritic monzogranite) and late pluton (monzogranite). U-Pb age determination of zircon by LA-ICPMS shows that the early pluton of Yemashan batholiths was intruded at (469.0±1.3) Ma, and the late pluton was intruded at (450.0±1.0) Ma. Compositionally, the early pluton of Yemashan batholiths has SiO2 values ranging from 59.8% to 64.2%, K2O/Na2O ratios higher than 1, and molar A/NKC ratios from 0.8 to 1.0, indicating typical metaluminous granitoid. The pluton is depleted in Ba, Nb, Ta, Sr, P and Ti, and enriched in Rb, U and Th, and has total REE content ranging from 97.73 × 10-6 to 185.76×10-6, (La/Yb)N from 5.57 to 12.47, and LREE/HREE from 7.7 to 11.3. The chondrite-normalized REE patterns of the pluton exhibit enrichment of LREE and depletion of HREE, with moderate negative Eu anomalies (δEu=0.66-0.89). The late pluton of Yemashan batholiths has SiO2 ranging from 69.8% to 76.5%, K2O/Na2O from 1.2 to 1.7, and molar A/NKC from 0.8 to 1.0, implying weakly peraluminous granitoid. It also shows enrichment of Rb, U and Th, and depletion of Ba, Nb, Ta, Sr, P and Ti, with ∑REE from 78.97×10-6 to 244.92×10-6, and (La/ Yb)N from 5.57 to 12.47. The chondrite-normalized REE patterns of the pluton exhibit enrichment of LREE and depletion of HREE, with pronounced negative Eu anomalies (δEu=0.11-0.24). The petrological and geochemical characteristics indicate that the early pluton of Yemashan batholiths could represent typical I-type granite formed in a subduction orogenic setting. The late pluton should be assigned to highly fractionated I-type granite formed in a post-collisional orogenic setting. On the basis of these features in combination with the tectonic locations of granite occurrence and field observation data, the authors hold that southward and northward subductions of the North Qilian oceanic plate took place in the Early Paleozoic, during which the southward subduction and collision resulted in the formation of Yemashan batholiths.

KW - Central Qilian

KW - LA-ICPMS zircon U-Pb dating

KW - double subduction

KW - Yemashan batholiths

UR - http://www.scopus.com/inward/record.url?scp=84930508614&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:84930508614

SN - 1000-3657

VL - 42

SP - 406

EP - 420

JO - Geology in China

JF - Geology in China

IS - 2

ER -

中祁连西段野马山岩基年代学、地球化学特征及地质意义

Abstract

Bibliographical note

Keywords

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