Abstrak-Gunung Kinabalu merupakan gunung yang tertinggi di Malaysia. Keunikan yang terdapat di dalam batuanbatuan Gunung Kinabalu ialah kewujudan pelbagai jenis enclave yang boleh dianggap sebagai tarikan saintifik dan estetik warisan geologi di Malaysia. Enclave merujuk kepada sebarang batuan atau mineral asing yang terkandung di dalam jasad batuan induk yang tidak berkaitan asalnya. Di Gunung Kinabalu, batuan granit hornblend mengandung enclave batuan metasedimen Formasi Trusmadi manakala granit hornblend porfirit pula mengandung enclave batuan metasedimen Formasi Trusmadi dan batuan serpentinit. Selain itu, zenolit granit hornblend turut terkandung di dalam korok keandesitan manakala zenolit granit hornblend porfirit dan zenolit batuan metasedimen Formasi Trusmadi terkandung di dalam korok aplit. Keunikan yang terdapat di dalam batuan granit hornblend ialah kehadiran kedua-dua jenis enclave, iaitu zenolit dan schlieren. Singkapan yang ditemui berdekatan puncak Gunung Kinabalu ini menunjukkan terdapatnya putaran enclave yang membentuk schlieren dan akhirnya zenolit. Fitur ini jelas menunjukkan bagaimana magma bergerak dan bagaimana batuan keliling diangkut menjadi zenolit. Untuk enclave jenis zenolit yang terdapat di dalam batuan granit hornblend porfirit pula terdapat penjajaran feldspar alkali yang jelas berhampiran sentuhan dengan zenolit tersebut, menunjukkan magma separa-beku dilencungkan. Selain itu, didapati juga zenolit yang berdekatan dengan sempadan penerobosan batuan bersaiz lebih kasar dan bersegi berbanding zenolit yang jauh, menandakan suhu magma lebih rendah dan zenolit yang terlebur semula lebih terbatas. Dari segi usia relatif, perkaitan jenis batuan dan enclave mencadangkan batuan termuda ialah korok aplit dan korok keandasitan, diikuti granit hornblend porfirit, serpentinit, granit hornblend dan batuan metasedimen Formasi Trusmadi. Selain bernilai saintifik dan estatik, enclave di Gunung Kinabalu juga mempunyai nilai rekreasi, lantaran kewujudannya ialah pada ketinggian 5 -8 km dari pintu masuk Timpohon, oleh itu berpotensi menjadi sebuah warisan geologi.Abstract-Mount Kinabalu is the highest mountain in Malaysia. The uniqueness of the Mount Kinabalu's rocks is the existence of varieties of enclaves with scientific and esthetic features of geological heritage value for Malaysia. Enclave refers to any country rock or mineral that was engulfed by a genetically unrelated host rock. In Mount Kinabalu, hornblende granite contains enclaves of metasedimentary rocks from Trusmadi Formation, whereas porphyritic granite contains the same Trusmadi Formation's rock and serpentinite. In addition, andesitic dykes contain xenoliths of hornblende granite, while aplite dykes contain xenoliths of Trusmadi Formation and the porphyritic granite. The unique feature of the hornblende granite is the existence of both types of enclaves, viz. xenolith and schlieren. The outcrop, found near the top of the Mount Kinabalu shows that the rotation of the enclave has produced schlieren and finally the xenolith. This featur...
An exposure of agate geode and nodules in Mount Conner, Sabah, provides an essential aspect to the geological formation in Semporna. This paper briefly report results from petrography analyses on the agate geode and nodules and its significance to the volcanic rocks and sedimentary rocks formation in Mount Conner. The geode and nodules can be divided into agate, and nodules and most of them are sub-rounded. Nodules are usually small in size and display brownish colour. It commonly occurs in volcanic rocks (dacite and rhyolite) and contained amygdale filled by secondary mineral such as microcrystalline and macrocystalline quartz. In contrast, sedimentary rocks in Mount Conner contain both nodules and geodes, which nodules shows similar characteristic with nodules in volcanic rocks and geodes contained empty vesicles or spaces surrounded by colourless to milky white quartz crystals. Both geode and nodules exhibit conchoidal fracture, while geode shows vesicle features and nodules in volcanic rocks show amygdale texture. The formation of geodes and nodules in Mount Conner might as result of precipitation under low temperature from hydrothermal solution.
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