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A. DE WAAL and Z XU LI MOURI and Fo The The ¤E-mail address: sadw@scientia.up.ac.za et Fo injection une la(Fig.1), a triangular continental mass consolidated atJinchuan region is represented by a fault-bounded,a granite yielding a UÐPb isotopic (zircon) age of 2.01861992a). We report evidence for the crystallization ofin conjunction with lithological data to establish a modi- ness of more than 3.5 km) and has a faulted contact, Fig. 2) to the north, which is also the north- 0.031 Ga (Tangseries of northeast-trending strike-slip faults (Fig. 2).age loss on ignition (LOI). Major-element analyses were . 1.Regional context of the Jinchuan Ultramafic Intrusion (adapted after Yang 374 . 2.Geological map of Jinchuan Ultramafic Intrusion (adapted after Jia 1986). were determined with an Eltra . 3.Oblique three-dimensional view of the Jinchuan Ultramafic Intrusion. Mining areas I, II, III and IV and the position of. 4.Profiles showing borehole intersections that were sampled and used in this study. Note the ÒtongueÓ (in two dimensions) ing intervals for the major elements in the olivine.chromian spinel cumulates. The interstitial materials areeither a silicate assemblage of orthopyroxene, clino-clase were altered to fine-grained amphibole (tscher- magnetite, calcite pyrite (or VISCOUSWhole-rock chemical compositionRepresentative whole rock compositions of samplescontaining variable amounts of olivine are listed inTable 3. The data-reduction procedures of the whole-rock chemical data used in this paper are provided inAppendix A.NomenclatureOwing to extensive alteration, it is difficult to deter-mine the precise modal quantities of all primary miner-als in the rocks by optical observation. Since olivine inthe samples exceeds 40 wt%, the rocks may be broadlydescribed as peridotite according to the IUGS nomen- . 5.Early cumulus orthopyroxene crystals (opx) enclosed in cumulus olivine. Arrows