Element Transfer Behaviors and Its Application During Lamprophyre Alteration in the Linglong Gold Deposit, Jiaodong Peninsula, China

Abstract

Abstract:

Lamprophyre dikes occur commonly in the Jiaodong ore cluster area. The altered lamprophyre rock is a good object to trace the geochemical characteristics of the alteration fluid. Two pairs of fresh and altered lamprophyre rocks were collected in the Linglong gold deposit on which 56 items of major oxides and trace elements were analyzed. The results indicate that the lamprophyre is rich in K2O and the REE didnt fractionate during the lamprophyre alteration in the Linglong gold deposit. Immobile plateau is a good method to determine the immobile elements during the lamprophyre alteration which overcomes the technical default of the Isocon method for fitting a line through the zero. Two methods of mass balance calculation and element content ratio were used here to discover the rich elements resulted from the alteration.The essential difference between these two methods is that the method of mass balance calculation includes a coefficient called the mass ratio of altered rocks to parent rocks relative to the method of element content ratio. The method of element content ratio can be viewed as a special example of the mass balance calculation method when the mass ratio of altered rocks to parent rocks is near to one. The transfer path of gold ore forming fluid could be the same as that of the lamprophyre dikes in the Linglong gold deposit. The fluid which altered the lamprophyre rock was rich in K₂O, Rb, Be, Ba, W, Pb, Zn, Sb, B, Mn, Ta, and poor in Na2O, CaO, MgO, and Sr. These elements of W, Pb, Zn, Sb, B, Be, Rb, and Ba can be selected as oreforming indicator elements in the Linglong gold deposit area.

Key words: Linglong gold deposit, lamprophyre alteration, immobile plateau, mass balance calculation, ore-forming indicator element；Jiaodong

GONG Qiang-Jie, ZHOU Lian-Zhuang, HU Yang, YAN Lei, ZHANG Han-Ai, GU Yu-Jie. Element Transfer Behaviors and Its Application During Lamprophyre Alteration in the Linglong Gold Deposit, Jiaodong Peninsula, China[J]. Geoscience, 2012, 26(5): 1065-1077.

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