Sains Malaysiana 46(6)(2017): 887–895

http://dx.doi.org/10.17576/jsm-2017-4606-07

Diagenetic History of the Chuping Limestone at Bukit Tungku Lembu, Perlis, Malaysia

(Sejarah Diagenesis Batu Kapur Chuping di Bukit Tungku Lembu, Perlis, Malaysia)

NOORHASHIMA BINTI ADENAN, CHE AZIZ ALI* & KAMAL ROSLAN MOHAMED

Geology Programme, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Diserahkan: 29 Jun 2016/Diterima: 11 November 2016

ABSTRACT

The Early Permian to Late Triassic limestone of Chuping Formation in Bukit Tungku Lembu consists of six microfacies and exhibits various types of diagenetic products, reflecting it's complicated diagenetic history. Out of 89 samples collected for petrographic studies, six major microfacies have been identified, namely brecciated limestone, dolomites, mudstones, wackestones, packstones and grainstones. Four major diagenetic processes comprising micritization, cementation, compaction and dolomitization have also been identified. Micritization occurs as the first phase diagenesis after the sediments were deposited on the sea floor, followed by cementation in the marine environment and also in meteoric environments when the shallow marine carbonate at some points in time was subjected to subaerial exposure. Early burial were indicated by fractures and deformation as well as destruction of grains whole structure. Increasing pressure during deeper burial has produced dissolution seams and stylolites. Dolomitization also occurred in the deeper burial environments.

Keywords: Chuping limestone; diagenesis; geochemistry; microfacies

ABSTRAK

Batu Kapur Chuping berusia Perm Awal hingga Trias Akhir di Bukit Tungku Lembu terdiri daripada enam mikrofasies dan memperlihatkan berbagai jenis hasil diagenesis, menggambarkan keragaman sejarahnya. Daripada 89 sampel yang dikutip untuk kajian petrografi, telah dikenal pasti enam mikrofasies iaitu batu kapur terbreksi, dolomit, batu lumpur, batu wak, batu padat dan batu butir. Empat proses diagenesis utama juga telah dikenal pasti seperti pemikritan, penyimenan, pemadatan dan pendolomitan. Pemikritan berlaku pada tahap awal diagenesis selepas sedimen dimendapkan di dasar laut, diikuti oleh penyimenan di sekitaran marin dan juga meteorik apabila sedimen pada suatu ketika terdedah kepada atmosfera. Penimbusan awal ditandai dengan peretakan dan canggaan serta pemusnahan keseluruhan butiran. Peningkatan tekanan semasa penimbusan menghasilkan pelarutan tekanan dan stilolit. Pendolomitan juga berlaku dalam sekitaran penimbusan dalam.

Kata kunci: Batu kapur Chuping; diagenesis; geokimia; mikrofasies

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*Pengarang untuk surat-menyurat; email: che@ukm.edu.my