U-Pb Zircon Age, Geochemical, and Sr-Nd-Pb Isotopic Constraints on the Age and Origin of Mafic Dykes from Eastern Shandong Province, Eastern China

被引：11

作者：

Liu Shen ^{[1
]}

Hu Ruizhong ^{[2
]}

Feng Caixia ^{[1
]}

Gao Shan ^{[3
]}

Feng Guangying ^{[2
]}

Lai Shaocong ^{[1
]}

Qi Youqiang ^{[2
]}

Coulson, Ian M. ^{[4
]}

Yang Yuhong ^{[2
]}

Yang Chaogui ^{[2
]}

Tang Liang ^{[2
]}

机构：

[1] NW Univ Xian, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China

[2] Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China

[3] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China

[4] Univ Regina, Dept Geol, Solid Earth Studies Lab, Regina, SK S4S 0A2, Canada

来源：

ACTA GEOLOGICA SINICA-ENGLISH EDITION | 2013年 / 87卷 / 04期

关键词：

Eastern China; eastern Shandong Province; foundering; mafic dykes; North China Craton; SULU OROGENIC BELT; LOWER CONTINENTAL-CRUST; POSTOROGENIC SYENITES; TRACE-ELEMENT; MANTLE; PETROGENESIS; NORTH; MAGMATISM; PERIDOTITE; BENEATH;

D O I：

10.1111/1755-6724.12109

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

U-Pb zircon age, geochemical, and Sr-Nd-Pb isotopic data of mafic dykes from eastern Shandong Province, eastern China is reported herein. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb zircon analyses of two samples from the investigated mafic dykes yield consistent ages ranging from 121.9 Ma +/- 0.47 Ma to 122.9 Ma +/- 0.61 Ma. The mafic dykes are characterized by high (Sr-87/Sr-86)(i) ranging from 0.7087 to 0.7089, low epsilon(Nd)(t) values ranging from -16.9 to -17.8, Pb-206/Pb-204 = 17.15 to 17.17, Pb-207/Pb-204 = 15.45 to 15.47, and Pb-208/Pb-204 = 37.59 to 37.68. Results from the current study suggest that the mafic dykes are derived from partial melting of ancient lithospheric mantle that was variably hybridized by melts derived from foundered lower crustal eclogite. The mafic dykes may have been generated through subsequent insignificant crystal fractionation and very minor crustal contamination during magma ascent. Combined with previous studies, the current findings provide new evidence that the intense lithospheric thinning beneath the eastern Shandong Province of eastern China occurred at approximate to 120 Ma, and that this condition was caused by the removal of the lower lithosphere (mantle and lower crust).

引用

页码：1045 / 1057

页数：13

共 54 条

[1] Correction of common lead in U-Pb analyses that do not report 204Pb [J].

Andersen, T .

CHEMICAL GEOLOGY, 2002, 192 (1-2) :59-79

[2] Speculations on the nature and cause of mantle heterogeneity [J].

Anderson, DL .

TECTONOPHYSICS, 2006, 416 (1-4) :7-22

[3] AN OPEN BOUNDARY BETWEEN LOWER CONTINENTAL-CRUST AND MANTLE - ITS ROLE IN CRUST FORMATION AND CRUSTAL RECYCLING [J].

ARNDT, NT ;

GOLDSTEIN, SL .

TECTONOPHYSICS, 1989, 161 (3-4) :201-212

[4]

Barry TL, 1998, GEODYNAMICS, V27, P347

[5] U-Pb zircon ages for a collision-related K-rich complex at Shidao in the Sulu ultrahigh pressure terrane, China [J].

Chen, JF ;

Xie, Z ;

Li, HM ;

Zhang, XD ;

Zhou, TX ;

Park, YS ;

Ahn, KS ;

Chen, DG ;

Zhang, X .

GEOCHEMICAL JOURNAL, 2003, 37 (01) :35-46

[6] TRACE-ELEMENT AND ISOTOPIC EFFECTS OF COMBINED WALLROCK ASSIMILATION AND FRACTIONAL CRYSTALLIZATION [J].

DEPAOLO, DJ .

EARTH AND PLANETARY SCIENCE LETTERS, 1981, 53 (02) :189-202

[7] RELATIONSHIPS BETWEEN CRUSTAL CONTAMINATION AND CRYSTALLIZATION IN CONTINENTAL FLOOD-BASALT MAGMAS WITH SPECIAL REFERENCE TO THE DECCAN TRAPS OF THE WESTERN GHATS, INDIA [J].

DEVEY, CW ;

COX, KG .

EARTH AND PLANETARY SCIENCE LETTERS, 1987, 84 (01) :59-68

[8]

Elkins-Tanton LT, 2005, GEOL SOC AM SPEC PAP, V388, DOI 10.1130/2005.2388(27)

[9] Osmium isotopic constraints on the nature of the DUPAL anomaly from Indian mid-ocean-ridge basalts [J].

Escrig, S ;

Capmas, F ;

Dupré, B ;

Allègre, CJ .

NATURE, 2004, 431 (7004) :59-63

[10] Recycling lower continental crust in the North China craton [J].

Gao, S ;

Rudnick, RL ;

Yuan, HL ;

Liu, XM ;

Liu, YS ;

Xu, WL ;

Ling, WL ;

Ayers, J ;

Wang, XC ;

Wang, QH .

NATURE, 2004, 432 (7019) :892-897

← 1 2 3 4 5 6 →