Global Geology 2016, 19(2) 78-84 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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diorite porphyry
western Shandong
YANG Haotian
SHI Jiangpeng
HUO Tengfei and YANG Donghong
Article by YANG Haotian
Article by SHI Jiangpeng
Article by HUO Tengfei and YANG Donghong

Petrogenesis of Paleoproterozoic diorite porphyries in Luojiazhuang,western Shandong: constraints from LA- ICP- MS zircon U- Pb geochronology and geochemistry

YANG Haotian, SHI Jiangpeng, HUO Tengfei and YANG Donghong

1. College of Earth Sciences,Jilin University,Changchun 130061,China; 2. Research Center of Palaeontology & Stratigraphy,Jilin University,Changchun 130026,China


Based on the study of LA- ICP- MS zircon U- Pb geochronology and whole- rock geochemistry for the Luojiazhuang diorite porphyries in Menying,western Shandong,the analyzed zircons exhibit oscillatory growth zoning in the cathodoluminescence images and have high Th/U ratios (0.15-1.53), indicating a magmatic ori- gin. In addition,most of the zircons have narrow metamorphic edges,suggesting that late metamorphic events may exist. The youngest group of magmatic zircon 207 Pb/ 206 Pb ages ranging from 2 384 Ma to 2 234 Ma,yiel- ding a weighted mean age of 2 353 ±14 Ma,which represents the forming age of the diorite porphyries,as the Early Paleoproterozoic. Geochemically,the samples are characterized by low SiO 2 (54.54% and 55.47%), high MgO (5.22% and 5.49%) and Mg # values (58 and 59). Moreover,they show enrichment of light rare earth elements and large ion lithophile elements (Rb,Ba and K),depletion of heavy rare earth elements and high field strength elements (Nb,Ta,Zr and Hf),positive anomaly of Pb,and negative anomaly of Ti. The fact implies that the Luojiazhuang diorite porphyries might derive from partial melting of enriched lithospheric mantle and mixed with an amount of continental crust material. In summary,they may form in the compression tectonic setting that stretching along the east- west direction at the North China Craton in the Early Paleoprotero- zoic.

Keywords Paleoproterozoic   diorite porphyry   geochronology   geochemistry   western Shandong  
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