Mongolia is situated between the Siberian and North China platforms and includes several Precambrian continentalblocks, which are fringed by Paleozoic and Mesozoic magmatic arcs, accretionary complexes and trapped oceanic crusts (Sengör et al., 1993). A number of porphyry, skarn and vein-type hydrothermal deposits have been discovered along these extinct magmatic arcs through regional geological mapping (Jargalsaihan, 1996). Thesedeposits form several metallogenic belts, which are genetically related to regional magmatism and tectonics (Distanov and Obolenskii, 1994; Dejidmaa, 1996). Although geology, alteration and mineralization of these deposits

have been described in explanatory reports of geological maps (e.g., Zabotkin, 1988), only a few geochronological studies have been undertaken for hydrothermal deposits (Sotnikov et al., 1974, 1995; Lamb and Cox, 1998; Muraoet al., 1998). The scarcity of age data for ore deposits makes it difficult to comprehend metallogeny in Mongolia. The Geological Research Center of Mongolia conducted a comprehensive project that re-examined geology (Teraoka et al., 1996), magmatism (Takahashi et al., 1998) and mineral deposits in the Bayankhongor region in central Mongolia (Fig. 1), where many hydrothermal deposits are associated with granitoids. This paper presents geology and K-Ar ages of the South, Huh Bulgiin Hundii, Saran Uul, Taats Gol and Han Uul deposits in the Bayankhongor region, and discusses metallogeny related to Paleozoic magmatism in the region.

Geology of Australian and Papua New Guinean Mineral Deposits heralds a new era in  the publication of The AusIMM Monograph Series. The new methodology involves a small Committee, including a Project Coordinator. It has proved most effective and economical.

The Monograph 22 Committee was established early in 1996, under the direction of Sandra Close, (Chairman of The AusIMM Publications Committee) with the Joint Editors, The AusIMM Publications Manager and the Project Coordinator. Overall parameters and criteria for papers were determined and a detailed Guide to Authors and Standard Operating Procedures were developed, to ensure a streamlined process. Over 300 companies were then invited to submit papers if their deposits met the criteria. The invitation was repeated in The AusIMM Bulletin and The Australian Geologist, to ensure that the volume’s coverage was comprehensive.

This chapter describes the regional geographical and geological setting of Connemara. The geology and the spatial distribution of Connemara’s metamorphic and igneous rocks are outlined. The Connemara Metamorphic Complex (CMC) comprises two major rock groupings: the Dalradian metamorphosed sedimentary and igneous rocks and the younger Metagabbro Gneiss Suite. South of Clifden in western Connemara a semi-circular area some 5 km across occurs within the Metagabbro Gneiss Suite and is called the Delaney Dome.

Geology came to occupy the pride of place in the country following Independence and rapid industrialization based on Five Year Plans of the Nehru era. Geological Survey of India, the premier earth science organization in the country, was considerably expanded and decentralized to the various States of India. National Research Institutes like the NGRI, PRL, CESS, WIHG, BSIP etc. were encouraged to develop rapidly, and the Universities urged to become centers of excellence.