PR_2014_xsw_Ca. 2.9 Ga granitoid magmatism in eastern Shandong, North China Craton.pdf

C C g S H a b c d a A R R 1 A A K M T J E Z H 1 m 1 o r o 2 Y c A h 0Precambrian Research 255 (2014) 538–562 Contents lists available at ScienceDirect Precambrian Research jo ur nal home p ag e: www.elsev ier .com/ locate /precamres a. 2.9 Ga granitoid magmatism in eastern Shandong, North China raton: Zircon dating, Hf-in-zircon isotopic analysis and whole-rock eochemistry hiwen Xiea, Hangqiang Xiea, Shijin Wangb, Alfred Kr?nera, Shoujie Liua, ongying Zhouc, Mingzhu Maa, Chunyan Donga, Dunyi Liua, Yusheng Wana,d,? Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Shandong Geological Survey Institute, Jinan 250013, China Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China r t i c l e i n f o rticle history: eceived 19 December 2013 eceived in revised form 1 September 2014 ccepted 17 September 2014 vailable online 5 October 2014 eywords: esoarchean TG uvenile crustal addition astern Shandong ircon dating f isotope a b s t r a c t Eastern Shandong is one of the important early Precambrian areas in the North China Craton, where exten- sive 2.5, 2.7 and 2.9 Ga magmatic activities have been identified, followed by very strong late Neoarchean and Paleoproterozoic tectono-thermal events. We carried out SHRIMP zircon dating, Hf-in-zircon iso- tope analysis and a whole-rock geochemical study on ca. 2.9 Ga Mesoarchean magmatic rocks. These include gneissic diorite, gneissic quartz diorite, gneissic tonalite and gneissic high-Si trondhjemite and were identified in five new areas. All these rocks contain ca. 2.5 Ga metamorphic zircons. The dioritic and tonalitic rocks are enriched in large ion lithosphile (LIL)