青藏高原北部查保马组火山岩的锆石SHRIMP U-Pb定年和地球化学特点及其成因意义

Qi Rong Wei; De Wei Li; Guo Can Wang; Jian Ping Zheng

青藏高原北部查保马组火山岩的锆石SHRIMP U-Pb定年和地球化学特点及其成因意义

Translated title of the contribution: Zircon SHRIMP U-Pb dating and geochemical characteristics of Chabaoma Formation volcanic rocks in northern Tibetan plateau and its petrogenesis

Qi Rong Wei^*, De Wei Li, Guo Can Wang, Jian Ping Zheng

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Chabaoma Formation volcanic rocks are located at the eastern Hoh Xil, northern Tibetan plateau, belong super-K C-type adakite, and formed in Miocene, Neogene period. Their SHRIMP U-Pb ages of zircon are from 13.2 0.6 to 18.3 1.1Ma. Volcanic rocks are characterized by high SiO₂ (59.48% to 64.63%), enriched in Na2_O + K₂O (7.52% to 8.30%), high in K₂O (4.21% to 4.62%), high in MgO (0.74% to 2.48%) and Mg^# values (0.26 to 0.51), and belong to shoshonite series. The ∑REE contents are very high (482.26 × 10^-6 to 592. 11 × 10^-6) especially enriched in LREE (466.47 × 10^-6 to 571.69 × 10^-6 ), but reversely depleted in HREE (14.00 × 10^-6 to 20.43 × 10^-6). The contents of Y and Yb are generally lower, which is from 13.29 10^-6 to 19.87 10^-6 (average 16.27 10^-6) and 1.11 10^-6 to 1.66 10^-6 (average 1.37 10^-6), respectively. REE patterns are strongly oblique to the HREE side with intensive enriched in LREE, and (La/Yb)_N values are from 61.02 to 91.67. Eu anomaly is invisible, which Eu/Eu * values from 0.74 to 0.86. The contents of Sr and Sr/Y value are also higher, Which from 949 10^-6 to 1497 10^-6 and 54 to 108, respectively. In the primitive mantel-normalized spidergrams of trace elements, obvious negative anomalies showed in Nb, Ta, P, Ti and Y. Chabaoma Formation super-K adakite are generated by partial melting of eclogitic phase lower crust section because the continental crust had been thickened (75-80km) and an eclogitic lower had been formed during Miocene, Neogene period in northern Tibetan plateau area.

Translated title of the contribution	Zircon SHRIMP U-Pb dating and geochemical characteristics of Chabaoma Formation volcanic rocks in northern Tibetan plateau and its petrogenesis
Original language	Chinese
Pages (from-to)	2727-2736
Number of pages	10
Journal	Acta Petrologica Sinica
Volume	23
Issue number	11
Publication status	Published - 2007
Externally published	Yes

Keywords

Chabaoma Formation
Northern Tibetan plateau
Petrogeochemistry
SHIRMP U-Pb dating of zircon
Super-K adakite

Cite this

@article{c853d53a2a804ad6a58a304699b15d20,

title = "青藏高原北部查保马组火山岩的锆石SHRIMP U-Pb定年和地球化学特点及其成因意义",

abstract = "Chabaoma Formation volcanic rocks are located at the eastern Hoh Xil, northern Tibetan plateau, belong super-K C-type adakite, and formed in Miocene, Neogene period. Their SHRIMP U-Pb ages of zircon are from 13.2 0.6 to 18.3 1.1Ma. Volcanic rocks are characterized by high SiO2 (59.48% to 64.63%), enriched in Na2O + K2O (7.52% to 8.30%), high in K2O (4.21% to 4.62%), high in MgO (0.74% to 2.48%) and Mg# values (0.26 to 0.51), and belong to shoshonite series. The ∑REE contents are very high (482.26 × 10-6 to 592. 11 × 10-6) especially enriched in LREE (466.47 × 10-6 to 571.69 × 10-6 ), but reversely depleted in HREE (14.00 × 10-6 to 20.43 × 10-6). The contents of Y and Yb are generally lower, which is from 13.29 10-6 to 19.87 10-6 (average 16.27 10-6) and 1.11 10-6 to 1.66 10-6 (average 1.37 10-6), respectively. REE patterns are strongly oblique to the HREE side with intensive enriched in LREE, and (La/Yb)N values are from 61.02 to 91.67. Eu anomaly is invisible, which Eu/Eu * values from 0.74 to 0.86. The contents of Sr and Sr/Y value are also higher, Which from 949 10-6 to 1497 10-6 and 54 to 108, respectively. In the primitive mantel-normalized spidergrams of trace elements, obvious negative anomalies showed in Nb, Ta, P, Ti and Y. Chabaoma Formation super-K adakite are generated by partial melting of eclogitic phase lower crust section because the continental crust had been thickened (75-80km) and an eclogitic lower had been formed during Miocene, Neogene period in northern Tibetan plateau area.",

keywords = "Chabaoma Formation, Northern Tibetan plateau, Petrogeochemistry, SHIRMP U-Pb dating of zircon, Super-K adakite",

author = "Wei, {Qi Rong} and Li, {De Wei} and Wang, {Guo Can} and Zheng, {Jian Ping}",

year = "2007",

language = "Chinese",

volume = "23",

pages = "2727--2736",

journal = "Acta Petrologica Sinica",

issn = "1000-0569",

publisher = "Science Press",

number = "11",

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TY - JOUR

T1 - 青藏高原北部查保马组火山岩的锆石SHRIMP U-Pb定年和地球化学特点及其成因意义

AU - Wei, Qi Rong

AU - Li, De Wei

AU - Wang, Guo Can

AU - Zheng, Jian Ping

PY - 2007

Y1 - 2007

N2 - Chabaoma Formation volcanic rocks are located at the eastern Hoh Xil, northern Tibetan plateau, belong super-K C-type adakite, and formed in Miocene, Neogene period. Their SHRIMP U-Pb ages of zircon are from 13.2 0.6 to 18.3 1.1Ma. Volcanic rocks are characterized by high SiO2 (59.48% to 64.63%), enriched in Na2O + K2O (7.52% to 8.30%), high in K2O (4.21% to 4.62%), high in MgO (0.74% to 2.48%) and Mg# values (0.26 to 0.51), and belong to shoshonite series. The ∑REE contents are very high (482.26 × 10-6 to 592. 11 × 10-6) especially enriched in LREE (466.47 × 10-6 to 571.69 × 10-6 ), but reversely depleted in HREE (14.00 × 10-6 to 20.43 × 10-6). The contents of Y and Yb are generally lower, which is from 13.29 10-6 to 19.87 10-6 (average 16.27 10-6) and 1.11 10-6 to 1.66 10-6 (average 1.37 10-6), respectively. REE patterns are strongly oblique to the HREE side with intensive enriched in LREE, and (La/Yb)N values are from 61.02 to 91.67. Eu anomaly is invisible, which Eu/Eu * values from 0.74 to 0.86. The contents of Sr and Sr/Y value are also higher, Which from 949 10-6 to 1497 10-6 and 54 to 108, respectively. In the primitive mantel-normalized spidergrams of trace elements, obvious negative anomalies showed in Nb, Ta, P, Ti and Y. Chabaoma Formation super-K adakite are generated by partial melting of eclogitic phase lower crust section because the continental crust had been thickened (75-80km) and an eclogitic lower had been formed during Miocene, Neogene period in northern Tibetan plateau area.

AB - Chabaoma Formation volcanic rocks are located at the eastern Hoh Xil, northern Tibetan plateau, belong super-K C-type adakite, and formed in Miocene, Neogene period. Their SHRIMP U-Pb ages of zircon are from 13.2 0.6 to 18.3 1.1Ma. Volcanic rocks are characterized by high SiO2 (59.48% to 64.63%), enriched in Na2O + K2O (7.52% to 8.30%), high in K2O (4.21% to 4.62%), high in MgO (0.74% to 2.48%) and Mg# values (0.26 to 0.51), and belong to shoshonite series. The ∑REE contents are very high (482.26 × 10-6 to 592. 11 × 10-6) especially enriched in LREE (466.47 × 10-6 to 571.69 × 10-6 ), but reversely depleted in HREE (14.00 × 10-6 to 20.43 × 10-6). The contents of Y and Yb are generally lower, which is from 13.29 10-6 to 19.87 10-6 (average 16.27 10-6) and 1.11 10-6 to 1.66 10-6 (average 1.37 10-6), respectively. REE patterns are strongly oblique to the HREE side with intensive enriched in LREE, and (La/Yb)N values are from 61.02 to 91.67. Eu anomaly is invisible, which Eu/Eu * values from 0.74 to 0.86. The contents of Sr and Sr/Y value are also higher, Which from 949 10-6 to 1497 10-6 and 54 to 108, respectively. In the primitive mantel-normalized spidergrams of trace elements, obvious negative anomalies showed in Nb, Ta, P, Ti and Y. Chabaoma Formation super-K adakite are generated by partial melting of eclogitic phase lower crust section because the continental crust had been thickened (75-80km) and an eclogitic lower had been formed during Miocene, Neogene period in northern Tibetan plateau area.

KW - Chabaoma Formation

KW - Northern Tibetan plateau

KW - Petrogeochemistry

KW - SHIRMP U-Pb dating of zircon

KW - Super-K adakite

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SN - 1000-0569

VL - 23

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EP - 2736

JO - Acta Petrologica Sinica

JF - Acta Petrologica Sinica

IS - 11

ER -

青藏高原北部查保马组火山岩的锆石SHRIMP U-Pb定年和地球化学特点及其成因意义

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Keywords

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