Structurally-controlled, linear reefs in a Pliocene delta-front setting, Tarakan basin, Northeast Kalimantan

Netherwood, R. E.; Wight, A. W. R.

doi:10.29118/ipa.1756.3.1.3.37

Cited by 3 publications

(2 citation statements)

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“…It is inferred that meteoric groundwater associated with the 'everwet' climate of Borneo was focused via aquifers through the adjacent deltaics causing extensive early alteration and cementation of the patch reefs (Madden & Wilson, in press). Similar diagenetic features in a range of coastal carbonates indicate that meteoric groundwater flow is likely to have a more important influence in the equatorial tropics than previously recognized (Netherwood & Wight, 1992;Hendry et al, 1999;Moore, 2001;Wilson & Hall, 2010). Recent research has shown that isolated carbonate platforms now caught up in fold and thrust belt development in North Borneo and Papua New Guinea are also strongly influenced by continental derived groundwaters (Warrlich et al, 2010).…”

Section: Impact Of Processes In the Equatorial Tropics On Carbonate Dmentioning

confidence: 74%

Equatorial carbonates: an earth systems approach

Wilson

2011

Sedimentology

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The hypothesis here is that an earth systems ‘processes to products’ approach can be used to better develop predictive models for the recognition and assessment of under‐evaluated equatorial carbonate systems. Warm temperatures, together with common clastic, fresh water and nutrient influx, as well as basinal settings in the equatorial tropics, all have a major impact on carbonate deposition and diagenesis. Specific features of equatorial carbonate systems resulting from the combination of processes acting in the region include: common occurrence of photoautotrophs and heterotrophs, aragonitic and/or calcitic dominant mineralogies, lack of coated grains or aggregates, common associations with clastics, lack of associations with evaporites, and diversity of platform types, including oligophotic ones. Additional diagenetic characteristics include: common micritization and bioerosion, paucity of marine cements, extensive vadose dissolution and concomitant phreatic cementation. There is also significant replacement of aragonite by calcite in regions of meteoric groundwater flow, common burial compaction and leaching, as well as localized massive dolomitization via sea water or continental derived groundwater flow. Although equatorial carbonates fall into the warm‐water Photozoan Association, many of the features described above are at odds with models derived from their warm‐water, arid‐zone counterparts. Instead, a range of the equatorial carbonate features show some similarities with those formed in cool waters, and there have been difficulties separating carbonates from these two very different climatic regimes. Recommendations for the recognition of Phanerozoic regional equatorial carbonate development are: (i) a diversity of calcitic and/or aragonitic photoautotrophs; plus (ii) common elements of the Heterozoan Association; plus (iii) independent (for example, isotopic) evidence for warm temperatures (>22°C). Additional indicators towards a humid equatorial setting are: (iv) situation in appropriate palaeolatitudes; (v) lack of association with sedimentary evaporites, coated grain or aggregates; and (vi) geochemical evidence for reduced marine salinity and/or nutrient upwelling. The aim is that this work will lead to greater awareness and understanding of equatorial carbonate systems, and contribute to the development of globally predictive models to better understand past and likely future environmental change.

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Section: Impact Of Processes In the Equatorial Tropics On Carbonate Dmentioning

confidence: 74%

Equatorial carbonates: an earth systems approach

Wilson

2011

Sedimentology

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“…The diagenesis of a number of SE Asian siliciclastic-influenced coastal carbonates show pervasive early neomorphism of aragonite (Netherwood and Wight 1992;Madden 2008;Wilson 2012), and hint that, similar to the Samarinda patch reefs, their diagenesis is strongly controlled by the role of a continental aquifer driving fluid flow. Few detailed diagenetic studies exist of delta-associated carbonates that developed during the Cenozoic, in humid, temperate, or arid settings.…”

Section: Basin Hydrologymentioning

confidence: 97%

Diagenesis of Neogene Delta-Front Patch Reefs: Alteration of Coastal, Siliciclastic-Influenced Carbonates from Humid Equatorial Regions

Madden¹,

Wilson²

2012

Journal of Sedimentary Research

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This study offers insights into the diagenetic alteration of coastal carbonates that formed coevally with nearly continuous siliciclastic influx in a humid equatorial setting. A multi-disciplinary petrographic, cathodoluminescent, stableisotope, trace-element and major-element investigation allowed characterization of diagenetic features, paragenetic sequencing, and an interpretation of diagenetic environments from Neogene patch reefs of the Samarinda region, Mahakam Delta, Borneo, SE Asia. Marine cements are absent from the patch reefs, with grain micritization the only marine diagenetic feature recognized. The predominant diagenetic feature within the patch reefs is pervasive neomorphic stabilization and cementation of aragonite reef components to calcite that pre-dates all compaction features. Meteoric aquifer flow derived from the adjacent landmass is inferred as the main parent diagenetic fluid, since d 18 O V-PDB values of calcite cements of 23.6 to 211.7% are consistent with precipitation from SE Asian freshwater, and inconsistent with a wholly marine origin. Late-stage fracturing, cementation, and chemical compaction are relatively minor features and attest to a changing paleohydrologic and diagenetic environment. Evidence for a shallow to moderate burial diagenetic regime for these later features are maximum temperature of 53 uC and burial depths , 1000 m inferred from stable-isotope values of calcite and late dolomite cements, dolomite crystal fabrics, the onset depth of stylolite or dissolution-seam formation, and regional geothermal gradients.

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A Review of Dolomites in Southeast Asia

Carnell¹,

Wilson²

Proc. Indon Petrol. Assoc., 29th Ann. Conv.

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Structurally-controlled, linear reefs in a Pliocene delta-front setting, Tarakan basin, Northeast Kalimantan

Cited by 3 publications

References 0 publications

Equatorial carbonates: an earth systems approach

Equatorial carbonates: an earth systems approach

Diagenesis of Neogene Delta-Front Patch Reefs: Alteration of Coastal, Siliciclastic-Influenced Carbonates from Humid Equatorial Regions

A Review of Dolomites in Southeast Asia

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