Structural controls on polyphase hydrothermal dolomitization in the Kinta Valley, Malaysia: Paragenesis and regional tectono-magmatism
|Author(s)||Ramkumar Mu1, 2, Siddiqui Numair Ahmed3, 4, Mathew Manoj1, 5, Sautter Benjamin3, 4, Hui Poon Xin3, Nagarajan R.6, Breitfeld H. Tim7, Santosh M.8, 9, Menier David10, Poppelreiter Michael1|
|Affiliation(s)||1 : Univ Teknol PETRONAS, South East Asia Carbonate Res Lab SEACaRL, Tronoh 31750, Perak, Malaysia.
2 : Periyar Univ, Dept Geol, Salem 636011, India.
3 : Univ Teknol PETRONAS, Dept Geosci, Tronoh 31750, Perak, Malaysia.
4 : Univ Teknol PETRONAS, Inst Hydrocarbon Recovery, Tronoh 31750, Perak, Malaysia.
5 : Univ Malaysia Terengganu, Inst Oceanog & Environm, Kuala Nerus 21030, Terengganu, Malaysia.
6 : Curtin Univ, Dept Appl Geol, Miri 98009, Sarawak, Malaysia.
7 : Royal Holloway Univ London, Dept Earth Sci, SE Asia Res Grp, Egham TW20 0EX, Surrey, England.
8 : China Univ Geosci, Beijing, Peoples R China.
9 : Univ Adelaide, Dept Earth Sci, Adelaide, SA 5005, Australia.
10 : Univ Bretagne Sud, Lab Geosci Ocean, UMR CNRS 6538, F-56017 Vannes, France.
|Source||Journal Of Asian Earth Sciences (1367-9120) (Pergamon-elsevier Science Ltd), 2019-05 , Vol. 174 , P. 364-380|
|WOS© Times Cited||5|
|Keyword(s)||Hydrothermal dolomite, Tectonics, Magmatism, Paragenesis, Structural evolution, Malaysia|
In the eastern side of the Malay Peninsula, thick successions of limestone formations preserve important records of the Mesozoic and Cenozoic tectonic events. Here we investigate the strata- and fracture-bound hydrothermal dolomites in the Palaeozoic carbonates of the Kinta Valley, western Peninsular Malaysia. Based on their textural and morphologic characteristics, structural relationships with the host rock, different facies types, and associations with hydrothermal calcite and low-grade metamorphic marble, we attempt to trace their polyphase origin and relationship with thereto-tectonic events of the region. A detailed evaluation of the nature of brecciation and crystallization of polyphase dolomites, dolomitic limestones, limestones and marble, under the influences of episodic faulting, is associated with the regional structural geology with emphasis on pre-existing fault reactivations, granitic emplacement and progressive thermal influence. Supply of Mg2+ from the host rock for dolomitization, limited and episodic influx of circulating fluids and cessation of thereto-tectonic evolution with progressive cooling are also inferred. Correlating the geological events in western Peninsular Malaysia with regional structural dynamics reveals that the major deformation episodes exerted first order controls on the loci of dolomite occurrences. The occurrence, geometry and structural relationships of the dolomites were controlled by successive magmatic events, whereas, the intensity of replacement dolomitization was controlled by host rock texture and varied bulk chemistry, together with the nature of circulating fluids.