FORMATION OF METALLOGENIC EMBRYO-FAULTS IN TECTONIC LENS
Received date: 2002-06-01
Revised date: 2002-09-24
Online published: 2003-04-01
According to the dividing line of peak value of stress/strain curve,lithofraction may be divided into two phases which the former develops embryo-fault and the latter forms macro-fault. Embryo-fault is a kind of special fracture types that are much less than macro-faults in nature. Compared with macrofault, embryo-fault only consists of minute fissures and micro-fissures without fault surface and cataclasite. Fissures don't link each other, have whole preferred orientation and assemble a series of fissure lens. Fissures grow mostly in the center of fissure group and in going outwards disappear gradually. The fissure lens group, in en echelon arrangement, is ease to be developed and conserved in the weak strain domain of tectonic lens. The primary deformation mechanism of embryo-fault is hydrofracture and stress corrosion, and its formation experiences three stages：microfissure closure, elastic deformation and microfissure growth dilation. On the basis of two medium-size gold deposits, authors study the geological feature of the metallotectonics discovered newly, realizing that the coupling between deformation partitioning, hydrofracturing and tectonic pumping plays a key part in the formation of embryo-fault and its mineralization. The orebodies may form in the forming process of embryo-fault.
Wang Jincao, Xia Bin, Tang Jingru . FORMATION OF METALLOGENIC EMBRYO-FAULTS IN TECTONIC LENS[J]. Advances in Earth Science, 2003 , 18(2) : 317 -320 . DOI: 10.11867/j.issn.1001-8166.2003.02.0317
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