Geology and Exploration Potential of the Gorontalo Basin, Central Indonesia – Eastern Extension of the North Makassar Basin?

Jablonski, D.; Priyono, P; Westlake, Shane; Larsen, Odd Arne

doi:10.29118/ipa.1482.07.g.083

Cited by 7 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high mountains of northern Sulawesi surround the deep basin of Gorontalo Bay. The onset of significant subsidence is marked by a change from shallow Miocene carbonates to growth of pinnacle reefs that subsequently drowned (Jablonski et al, 2007;Pholbud et al, 2012) and we suggest this began in the Early Pliocene. Plio-Pleistocene sediments derived from the East Arm are now exposed in the Togian Islands (Cottam et al, 2011) where they are separated from the East Arm by water depths of more than 1 km.…”

Section: Discussionmentioning

confidence: 51%

“…The reworked material was deposited into the adjacent basins, such as Gorontalo Bay, that subsided contemporaneously with the uplift, induced by extension associated with rollback at the North Sulawesi subduction zone. Thick sediment sequences exposed on land in the North Arm and Central Sulawesi are the supposed equivalents of large sediment packages offshore with a reported thickness of 6-10 km (Jablonski et al, 2007). Some of the formations have organic-rich material and contain limestone intercalations, which could provide the prerequisites for a hydrocarbon system.…”

Section: Discussionmentioning

confidence: 99%

“…Further west, interpretations differ. Kadarusman et al (2004) suggested that the western part of GorontaloBay is underlain by oceanic crust of the East Sulawesi Ophiolite, thrust over the Banggai-Sula Block, whereas Jablonski et al (2007), van Leeuwen et al (2007, Cottam et al (2011) and Pholbud et al (2012) favoured an Australian-origin continental basement. Our fieldwork and dating of rocks in this study supports the conclusion that the western part of Gorontalo Bay is underlain by Australian continental crust added to the Sundaland margin in the Cretaceous.…”

Section: Exhumation Ratesmentioning

confidence: 99%

“…Sulawesi has a complex tectonic history that is affected by major plate re-organisations during the Cenozoic resulting in an extension-dominated setting in an overall setting of convergence of the Indo-Australian, Pacific and Philippine Sea, and Eurasian plates (Hall, 1996Spakman & Hall, 2010). Gorontalo Bay is a deep basin in northern Sulawesi (Figure 1) that has rapidly subsided during the late Neogene to a water-level depth of c. 2 km, indicated by drowned pinnacle reefs (Jablonski et al, 2007). Sediments within the bay have a thickness of 6-10 km interpreted from seismic thicknesses of >6seconds TWT (Jablonski et al, 2007;Pholbud et al, 2012) suggesting hydrocarbon potential.…”

Section: Introductionmentioning

confidence: 99%

“…Gorontalo Bay is a deep basin in northern Sulawesi (Figure 1) that has rapidly subsided during the late Neogene to a water-level depth of c. 2 km, indicated by drowned pinnacle reefs (Jablonski et al, 2007). Sediments within the bay have a thickness of 6-10 km interpreted from seismic thicknesses of >6seconds TWT (Jablonski et al, 2007;Pholbud et al, 2012) suggesting hydrocarbon potential. Little is known about the timing of this rapid subsidence.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Large Sediment Accumulations and Major Subsidence Offshore; Rapid Uplift on Land: Consequences of Extension of Gorontalo Bay and Northern Sulawesi

Hennig¹,

Advokaat²,

Rudyawan³

et al.

Proc. Indonesian Petrol. Assoc., 38th Ann. Conv.

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 51%

Section: Discussionmentioning

confidence: 99%

Section: Exhumation Ratesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Large Sediment Accumulations and Major Subsidence Offshore; Rapid Uplift on Land: Consequences of Extension of Gorontalo Bay and Northern Sulawesi

Hennig¹,

Advokaat²,

Rudyawan³

et al.

Proc. Indonesian Petrol. Assoc., 38th Ann. Conv.

View full text Add to dashboard Cite

A Late Miocene magmatic flare-up in West Sulawesi triggered by Banda slab rollback

et al. 2020

View full text Add to dashboard Cite

Cenozoic magmatism occurs throughout West Sulawesi, Indonesia, yet its detailed evolution remains enigmatic due mainly to the scarcity of precise dating. Here, we report new whole-rock geochemical and zircon U-Pb-Hf isotopic data of plutonic/volcanic rocks and river sediments from West Sulawesi to constrain the petrogenesis and magmatic tempo. The magmatic rocks are intermediate to felsic (SiO2 = 58.1−68.0 wt%), high-K calc-alkaline to shoshonitic (K2O = 2.2−6.0 wt%), metaluminous to weakly peraluminous, and I-type in composition. Trace element concentrations and ratios (e.g., Nb/U = 1.7−4.3 and Ti/Zr <28), along with negative zircon εHf(t) values (−17.0 to −0.4) and old crustal model ages (TDMC = 2.1−1.1 Ga), indicate a dominant magma source region from the underlying continental crystalline basement. U-Pb dating on zircons from ten magmatic rocks yielded weighted mean 206Pb/238U ages of 7.2−6.1 Ma, best representing the crystallization ages of host magmas, further consistent with the prominent age peaks (7.3−6.3 Ma) defined by detrital zircons from four sedimentary samples. Our new data, combined with available results, allow the identification of a noticeable climax of magmatism (flare-up) at ca. 7−6 Ma, forming a continuous magmatic belt throughout West Sulawesi. Given the absence of contemporaneous subduction and the coincidence of incipient opening of the South Banda Basin during ca. 7.15−6.5 Ma, the Late Miocene magmatic flare-up in West Sulawesi and coeval regional extension in eastern Indonesia are attributed to a resumed episode of Banda slab rollback.

show abstract

Tectonic re-interpretation of the Banggai-Sula–Molucca Sea margin, Indonesia

Watkinson

Hall

Ferdian

2011

View full text Add to dashboard Cite

High resolution multibeam bathymetric and seismic data from the area north of the Banggai-Sula Islands, Indonesia, provide a new insight into the geological history of the boundary between the East Sulawesi ophiolite, the Banggai-Sula microcontinent and the Molucca Sea collision zone. Major continuous faults such as the Sula Thrust and the North Sula–Sorong Fault, previously interpreted to bound and pass through the area are not seen. The south-verging Batui Thrust previously interpreted offshore to the east of Poh Head cannot be identified. In the areas where the thrust was interpreted there is a north-vergent thrust and fold zone overlain by almost undeformed sediments. Gently dipping strata of the Banggai-Sula microcontinent margin can be traced northwards beneath younger rocks. In the east, rocks of the Molucca Sea collision complex are deformed by multigenerational folds, thrusts and strike-slip faults. There is a series of small thrusts between the leading edge of the collision complex and the foot of the slope. In the west a zone of transpression close to the East Arm of Sulawesi is the termination of the dextral strike-slip Balantak Fault extending east from Poh Head.

show abstract

Geology and Exploration Potential of the Gorontalo Basin, Central Indonesia – Eastern Extension of the North Makassar Basin?

Cited by 7 publications

References 0 publications

Large Sediment Accumulations and Major Subsidence Offshore; Rapid Uplift on Land: Consequences of Extension of Gorontalo Bay and Northern Sulawesi

Large Sediment Accumulations and Major Subsidence Offshore; Rapid Uplift on Land: Consequences of Extension of Gorontalo Bay and Northern Sulawesi

A Late Miocene magmatic flare-up in West Sulawesi triggered by Banda slab rollback

Tectonic re-interpretation of the Banggai-Sula–Molucca Sea margin, Indonesia

Contact Info

Product

Resources

About