The Mount Kinabalu granite of North Borneo: result and cause of orogenic deformation

摘要: Mount Kinabalu is a granite body in north Borneo that intrudes rocks deformed in the Early Miocene Sabah Orogeny following subduction of the South China continental margin beneath the north Borneo margin. Kinabalu is the highest mountain in SE Asia at 4100m and ice action during Pleistocene glaciations has resulted in excellent exposure of the summit area. The granite has previously been interpreted as a compositionally zoned, steeply sided pluton with a central biotite granodiorite, surrounded by hornblende granite and a marginal porphyritic facies. New zircon U-Pb SHRIMP ages record emplacement and crystallization. Zircon fission track data and apatite (U-Th)/He dates record the development and exhumation of the orogen. U-Pb SHRIMP analyses of concentric growth zones in zircon date crystallisation of the granite at between 7.85 and 7.22 Ma. The ages support models relating the Kinabalu granite …