Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia
Study of secondary dolomitization and documentation of the evolution of basinal fluids and host rock, especially that of fine-grained deepwater carbonate mudstone are of interest toward of reservoir characterization. From this perspective, field characteristics in relation to mineralogy, petrography...
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Institute for Ionics
2022
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my.utp.eprints.337732022-09-13T04:16:50Z Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia Hui, P.X. Nagarajan, R. Ramkumar, M. Ng, T.F. Taib, N.I. Mathew, M.J. Sautter, B. Siddiqui, N.A. Poppelreiter, M.C. Study of secondary dolomitization and documentation of the evolution of basinal fluids and host rock, especially that of fine-grained deepwater carbonate mudstone are of interest toward of reservoir characterization. From this perspective, field characteristics in relation to mineralogy, petrography and geochemistry of the Paleaozoic carbonates of the Kinta Valley, Peninsular Malaysia, were investigated and documented. A total of 33 samples were collected across the various degree of dolomitization and analyzed for their petrographic properties (n = 55), while mineralogical and geochemical compositions (n = 33) were analyzed using XRD, ICP and ICPMS analysis, respectively. These analyses were performed to elucidate the diagenetic events, episodic dolomitization and development of fluid evolution as a function of regional tectono-thermal events during the Permian to Cenozoic. It is interpreted that the host calcareous mudstones (HCMs) were deposited in oxygenated, open marine seawaters. The studied samples retain the original seawater characteristics despite negligible, minor alterations of REE characteristics due to diagenesis and detrital input. Though the concentrations and trends of REEs of the dolomitic facies are modified to a certain extent, their affinities with HCMs are preserved. Enrichments of Mg, Mn, Na and depletion of Sr are linked to the effect of dolomitization under the open system of diagenesis. The redox conditions fluctuated to show distinct, recognizable variations between different dolomite phases. The MREE enrichments with other trace elements such as Mn, Fe and low Sr content indicate the association of diagenetic fluids with deep-circulating crustal hydrothermal fluids. Hydrothermal influence has been recorded along the fractures, which might have originated from the sub-surface litho units and facilitated episodic dolomitization, especially during significant tectono-thermal events. This study affirms that the occurrence, geochemical and mineralogical evolution of the dolomites of the Kinta Valley were controlled by magmatic events, whereas the intensity of replacement dolomitization was controlled by host rock texture, varied bulk chemistry of host rock, circulating fluid and temperature. © 2022, The Author(s). Institute for Ionics 2022 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85137187032&doi=10.1007%2fs13146-022-00802-4&partnerID=40&md5=e60a46b0104450415a8b2f9c1e500b55 Hui, P.X. and Nagarajan, R. and Ramkumar, M. and Ng, T.F. and Taib, N.I. and Mathew, M.J. and Sautter, B. and Siddiqui, N.A. and Poppelreiter, M.C. (2022) Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia. Carbonates and Evaporites, 37 (4). http://eprints.utp.edu.my/33773/ |
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Study of secondary dolomitization and documentation of the evolution of basinal fluids and host rock, especially that of fine-grained deepwater carbonate mudstone are of interest toward of reservoir characterization. From this perspective, field characteristics in relation to mineralogy, petrography and geochemistry of the Paleaozoic carbonates of the Kinta Valley, Peninsular Malaysia, were investigated and documented. A total of 33 samples were collected across the various degree of dolomitization and analyzed for their petrographic properties (n = 55), while mineralogical and geochemical compositions (n = 33) were analyzed using XRD, ICP and ICPMS analysis, respectively. These analyses were performed to elucidate the diagenetic events, episodic dolomitization and development of fluid evolution as a function of regional tectono-thermal events during the Permian to Cenozoic. It is interpreted that the host calcareous mudstones (HCMs) were deposited in oxygenated, open marine seawaters. The studied samples retain the original seawater characteristics despite negligible, minor alterations of REE characteristics due to diagenesis and detrital input. Though the concentrations and trends of REEs of the dolomitic facies are modified to a certain extent, their affinities with HCMs are preserved. Enrichments of Mg, Mn, Na and depletion of Sr are linked to the effect of dolomitization under the open system of diagenesis. The redox conditions fluctuated to show distinct, recognizable variations between different dolomite phases. The MREE enrichments with other trace elements such as Mn, Fe and low Sr content indicate the association of diagenetic fluids with deep-circulating crustal hydrothermal fluids. Hydrothermal influence has been recorded along the fractures, which might have originated from the sub-surface litho units and facilitated episodic dolomitization, especially during significant tectono-thermal events. This study affirms that the occurrence, geochemical and mineralogical evolution of the dolomites of the Kinta Valley were controlled by magmatic events, whereas the intensity of replacement dolomitization was controlled by host rock texture, varied bulk chemistry of host rock, circulating fluid and temperature. © 2022, The Author(s). |
| format |
Article |
| author |
Hui, P.X. Nagarajan, R. Ramkumar, M. Ng, T.F. Taib, N.I. Mathew, M.J. Sautter, B. Siddiqui, N.A. Poppelreiter, M.C. |
| spellingShingle |
Hui, P.X. Nagarajan, R. Ramkumar, M. Ng, T.F. Taib, N.I. Mathew, M.J. Sautter, B. Siddiqui, N.A. Poppelreiter, M.C. Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia |
| author_facet |
Hui, P.X. Nagarajan, R. Ramkumar, M. Ng, T.F. Taib, N.I. Mathew, M.J. Sautter, B. Siddiqui, N.A. Poppelreiter, M.C. |
| author_sort |
Hui, P.X. |
| title |
Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia |
| title_short |
Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia |
| title_full |
Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia |
| title_fullStr |
Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia |
| title_full_unstemmed |
Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia |
| title_sort |
geochemical evolution of structure-bedding controlled hydrothermal dolomites of the kinta valley, western malaysia |
| publisher |
Institute for Ionics |
| publishDate |
2022 |
| url |
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85137187032&doi=10.1007%2fs13146-022-00802-4&partnerID=40&md5=e60a46b0104450415a8b2f9c1e500b55 http://eprints.utp.edu.my/33773/ |
| _version_ |
1744356214120120320 |
| score |
13.211869 |