Episodic dolomitization of Paleozoic limestones in the Kinta Valley, Malaysia: Implications on porosity evolution and reservoir properties

Hui, Poon Xin; Ramkumar, Mu.; Nagarajan, R.; Mathew, Manoj Joseph; Ng, Tham Fatt

doi:10.1016/j.engeos.2020.11.003

Cited by 2 publications

(5 citation statements)

References 32 publications

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“…Subsequently, the REE patterns of the Kinta dolomites were preserved even though the dolomitization was not mediated by seawater or seawater-like fluids. The inference of dolomitization from basinal brines is in conformity with previous studies (Ramkumar et al 2019) that espoused episodic dolomitization by tectono-thermal events; Xin Hui et al (2021) that proposed local and limited availability of Mg 2+ for dolomitization).…”

Section: Diagenetic Fluidssupporting

confidence: 90%

“…However, the total REE concentrations in dolomite samples do not show a significant correlation with either Sr or Na (salinity indicators). These geochemical behaviors of the studied samples are anticipated due to previous studies (Ramkumar et al2019;Xin Hui et al 2021) and field and petrographic observations where occurrences of hydrothermal alteration are reported. These studies interpreted that the fluids originated from the underlying rocks, channeled up-dip through the fractured system, and dolomitized the HCMs of the Kinta Valley.…”

Section: Diagenetic Fluidssupporting

confidence: 67%

“…The comparatively higher Fe and Mn contents of HCMs (least dolomitized) also support the inference of subsurface, reducing conditions of dolomitization (Land 1986;Warren 2000). The first dolomitization event could be associated with the folding and faulting prevalent during the Permo-Triassic Sibumasu-East Malaya collision (Ramkumar et al 2019;Xin Hui et al 2021). The presence of positive Eu anomalies and highest Ba values indicate the involvement of diagenetic fluids of high temperature (Bau and Dulski 1999;Frimmel 2009;He et al 2006).…”

Section: Paragenesis and Implications For Tectonic And Thermal Eventsmentioning

confidence: 74%

“…The control exerted by Mg/ Ca ratio of the diagenetic fluids for Ca % of the dolomites (e.g., Zhao and Jones 2012) is also demonstrated by the calcian nature of the studied samples. The Kinta carbonates are interpreted to be selectively dolomitized and altered by hydrothermal dolomitization (Ramkumar et al 2019;Mohammad Zahir et al 2020;Xin Hui et al 2021). These studies add support to the inferences on calcian dolomites which are the major control of dolomitization.…”

Section: Dolomitizationmentioning

confidence: 86%

“…for allowing the channeling of the dolomitizing fluid. The diagenetic system was increasingly open as reflected by decreased Sr contents (Brand and Veizer 1980) contributed by micro faults, fractures and stylolites formed during the episodic tectonic event (Ramkumar et al 2019;Xin Hui et al 2021).…”

Section: Paragenesis and Implications For Tectonic And Thermal Eventsmentioning

confidence: 99%

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Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia

Hui

Nagarajan

Ramkumar

et al. 2022

Carbonates Evaporites

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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.

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Section: Diagenetic Fluidssupporting

confidence: 90%

Section: Diagenetic Fluidssupporting

confidence: 67%

Section: Paragenesis and Implications For Tectonic And Thermal Eventsmentioning

confidence: 74%

Section: Dolomitizationmentioning

confidence: 86%

Section: Paragenesis and Implications For Tectonic And Thermal Eventsmentioning

confidence: 99%

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Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia

Hui

Nagarajan

Ramkumar

et al. 2022

Carbonates Evaporites

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Decolourisation of Real Industrial and Synthetic Textile Dye Wastewater Using Activated Dolomite

Zahuri

Patah

Kamarulzaman

et al. 2023

Water

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Textile effluent accounts for 22% of the total industrial wastewater produced in Malaysia. Due to their ubiquitous use in organic dyes, inefficiently treated textile wastewaters pose environmental and health hazards. Colour, chemical oxygen demand, biochemical oxygen demand, toxic metals and microbes are the commonly targeted water quality parameters in untreated textile fluids. Furthermore, their non-biodegradability and high colour intensity may reduce aquatic diversity by blocking the sunlight. Recently, physical treatment, principally adsorption, has been conducted. Dolomite has additional features, such as performing as a heavy metal and microbe remover. This study employed dolomite for treating textile dye wastewater from a commercial textile manufacturer and synthetic effluent containing methyl orange. Different sizes of dolomite were activated at different temperatures and subsequently added to the water samples in varying amounts. After 2 h of agitation at 100 rpm and sedimentation for 24 h, their absorbance reading was taken. Their morphological, decolourisation percentage, chemical oxygen demand reduction percentage and bacterial growth post-treatment were examined. Despite variances in dolomite’s capacity to decolourise colours, the treatment proved effective in decolourising dyes, removing chemical oxygen demand and reducing bacterial growth. The most significant percentages of decolourisation observed were 98.7% for real textile dye wastewater (RTDW) and 78.0% for synthetic textile dye wastewater (STDW), while for chemical oxygen demand, reductions were 66.7% for RTDW and 73.9% for STDW, respectively. As for microbe growth inhibition, the highest growth reduction percentages were 99.7% and 98.6% for RTDW and STDW, respectively.

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Episodic dolomitization of Paleozoic limestones in the Kinta Valley, Malaysia: Implications on porosity evolution and reservoir properties

Cited by 2 publications

References 32 publications

Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia

Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia

Decolourisation of Real Industrial and Synthetic Textile Dye Wastewater Using Activated Dolomite

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