Abstract
Granite at Penggongmiao is a large batholith in the Nanling Range, with an outcrop area of over 900 km2. There are many scheelite-quartz veins around the granite. LA-ICP-MS U-Pb dating was carried out for zircons from the granite. The middle-coarse-grained biotite granite has U-Pb ages of 435 to 436 Ma. Ages of 426.5±2.5 Ma were obtained for aplitic dyke cross-cutting the granite. The scheelite of magmatic origin in the aplite dyke was identified from petrographic investigation. This demonstrates that W-bearing granites of Early Paleozoic (corresponding to the Caledonian orogensis in the traditional sense) occur in the Nanling Range. This finding has important implications for the ore-forming potential of Paleozoic granites and on the extent of Mesozoic mineralization. Thus it merits performing an intensive study of Paleozoic granites in South China. The occurrences of aplite or microgranite may be an indicative of the Caledonian tungsten granites and associated W mineralization.
Highlights
Granite at Penggongmiao is a large batholith in the Nanling Range, with an outcrop area of over 900 km2
Paleozoic granites in South China have been investigated in relation to W-Sn metallogenesis in previous studies [5–8], some questions still remain regarding these specific types of granites
From 1956 to 1961, geologists from the Department of Geology in Nanjing University first assigned this granite as being emplaced in the Early Paleozoic as a response to the Caledonian orogensis in the traditional sense
Summary
From 1956 to 1961, geologists from the Department of Geology in Nanjing University first assigned this granite as being emplaced in the Early Paleozoic as a response to the Caledonian orogensis in the traditional sense This was based on its unconformable relationship with the middleDevonian Tiaomajian Formation [1–4]. The later stage includes the latter two units, and is composed of fine-grained, porphyritic, biotite monzonite granites This later stage comprises the remaining 40% of the entire batholith, and is mainly situated in a west to north–east direction with regard to the siliceous fractured zone. Eleven scheelite-quartz veins were found aligned in a NE direction at the southern margin of the PGM granite, in contact with the surrounding rock [5] These veins vary from 400 to 1800 m long, but their spatial relationship with the aplitic dyke has not yet been determined because of limited field engineering capacity
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