Genesis Granit Muncung dari Pulau Lingga Berdasarkan Data Geokimia dan Mikroskopis
DOI:
https://doi.org/10.33332/jgsm.geologi.v16i3.38Abstract
Granit Muncung dan Granit Tanjungbuku merupakan dua satuan granitoid yang terdapat di Pulau Singkep. Sebelumnya telah diketahui bahwa Granit Muncung merupakan tipe-S dan sebagai bagian dari 'Main Range Granite Province' di Asia Tenggara. Penelitian terkini menyebutkan bahwa Granit Muncung dapat dikelompokkan dalam dua fasies berdasarkan kandungan geokimia. Penelitian ini mengulas lebih lanjut mengenai Granit Muncung yang terdapat di Pulau Singkep melalui data geokimia dan mikroskopis. Dengan memanfaatkan genesa yang lebih terperinci dan up to date, hipotesis Granit Muncung sebagai tipe-S turut diperkuat melalui makalah ini. Karakter contoh terpilih sebagai granitoid yang cenderung ferroan menunjukkan kelimpahan Fe yang lebih besar relatif terhadap Mg. Penambahan K dan Na, maupun pengurangan Ca selama diferensiasi diduga berhubungan dengan sifat alkali-calcic pada batuan granitik ini. Data mikroskopis, diagram ANK vs A/CNK maupun penghitungan ASI menunjukkan sifat peralumina kuat dari contoh ini.
Kata kunci - geokimia, Granit Muncung, tipe-S, Pulau Singkep, peralumina
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