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

Hennig, Juliane; Advokaat, Eldert L.; Rudyawan, Alfend; Hall, Robert

doi:10.29118/ipa.0.14.g.304

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…Similar extension, most recently associated with subduction rollback but at a less advanced stage, is associated with the development of the North Sulawesi subduction zone (Hennig et al 2014, Pezzati et al 2014, Hall & Spakman 2015, where the Celebes Sea lithosphere is being subducted southward below the North Arm of Sulawesi. Late Pliocene rollback of the North Sulawesi subduction zone caused subsidence of Gorontalo Bay to water depths of up to 2 km and uplift of the Sulawesi Neck and parts of Central Sulawesi to elevations close to 3 km (Figure 7).…”

Section: Figurementioning

confidence: 56%

“…Most of the exhumation on land is demonstrably Pliocene, as shown by U-Pb crystallization ages of zircons from granites (Hennig et al 2016), cooling ages of micas associated with extensional fabrics, and apatite U/Th-He ages recording cooling below approximately 70 • C (Hennig et al 2014). Metamorphism associated with extension is also indicated by mineral assemblages that demonstrate low-pressure/high-temperature Buchan-type metamorphism producing andalusite, cordierite, staurolite, and spessartine-rich garnets, which are known from both SW Borneo (Davies et al 2014) and Sulawesi (Hennig et al 2014).…”

Section: Figurementioning

confidence: 99%

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Southeast Asia: New Views of the Geology of the Malay Archipelago

Hall

2017

Annu. Rev. Earth Planet. Sci.

110

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Southeast (SE) Asia is surrounded by subduction zones causing intense seismicity and volcanic activity. Subduction has been the principal tectonic driver of collisions that caused the growth of continental SE Asia, and most recently the collision of Australia with SE Asia. The western part of SE Asia, Sundaland, is a heterogeneous and weak region, reflecting processes that can be observed today in the east, where there are subduction zones in different stages of development. A close relationship between subduction rollback and extension has caused dramatic elevation of land, exhumation of deep crust, and spectacular subsidence of basins, observable with remotely acquired images and seismic and multibeam data obtained from oil exploration. New dating indicates that subsidence and uplift occurred at high rates during short time intervals. Laboratory studies, modeling, and reconstructions provide valuable insights, but field-based studies continue to present surprises and new discoveries essential for interpretations of the geological history of the region.

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Section: Figurementioning

confidence: 56%

Section: Figurementioning

confidence: 99%

Southeast Asia: New Views of the Geology of the Malay Archipelago

Hall

2017

Annu. Rev. Earth Planet. Sci.

110

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“…Restoring the inferred subducted slab implies a major separation between the North Arm and the Sula Spur in the Late Miocene and Pliocene, whereas geological observations show they collided in the Early Miocene, emplacing the ophiolite on the Sula Spur, and since then have been close together. Recent studies of the offshore and onshore geology show that during the Late Miocene and Pliocene this region has extended rather than contracted Hennig et al, 2012Hennig et al, , 2014Pezzati et al, 2014a,b;Spencer, 2010Spencer, , 2011. The Early Miocene suture zone is now overlain by a several kilometre thick sequence of almost undeformed sediments (Pholbud et al, 2012).…”

Section: North Sulawesi Trench Subductionmentioning

confidence: 94%

Mantle structure and tectonic history of SE Asia

2015

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“…They also report Quaternary reef limestone as high as 1000 m both along the western margin and on the northern arm of Sulawesi. In the north arm of Sulawesi, Hennig et al [2014] reported late Miocene to Pliocene granitic intrusions and volcanic rock that has been exhumed rapidly,~1-4 mm/yr. They infer rapid emergence of this region and cite Plio-Pleistocene sediment adjacent to the region as supporting evidence of rapid recent erosion.…”

Section: A5 Sulawesi the Makassar Strait And The Sula Islandsmentioning

confidence: 99%

Growth of the Maritime Continent and its possible contribution to recurring Ice Ages

Molnár

Cronin

2015

Paleoceanography

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The areal extent of the Maritime Continent (the islands of Indonesia and surrounding region) has grown larger by~60% since 5 Ma. We argue that this growth might have altered global climate in two ways that would have contributed to making recurring Ice Ages possible. First, because rainfall over the islands of the Maritime Continent not only is heavier than that over the adjacent ocean but also correlates with the strength of the Walker Circulation, the growth of the Maritime Continent since 5 Ma may have contributed to the cooling of the eastern tropical Pacific since that time. Scaling relationships between the strength of the Walker Circulation and rainfall over the islands of the Maritime Continent and between sea surface temperature (SST) of the eastern tropical Pacific and the strength of easterly wind stress suggest that the increase in areal extent of islands would lead to a drop in that SST of 0.75°C. Although only a fraction of the 3-4°C decrease in SSTs between the eastern and western tropical Pacific, the growth of the Maritime Continent may have strengthened the Walker Circulation, increased the east-west temperature gradient across the Pacific and thereby enabled ice sheets to wax and wane over Canada since 3 Ma. Second, because the weathering of basaltic rock under warm, moist conditions extracts CO 2 from the atmosphere more rapidly than weathering of other rock or of basalt under cooler or drier conditions, the increase in weathering due to increasing area of basalt in the Maritime Continent may have drawn down enough CO 2 from the atmosphere to affect global temperatures. Simple calculations suggest that increased weathering of basalt might have lowered global temperatures by 0.25°C, possibly important for the overall cooling.

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

Cited by 7 publications

References 23 publications

Southeast Asia: New Views of the Geology of the Malay Archipelago

Southeast Asia: New Views of the Geology of the Malay Archipelago

Mantle structure and tectonic history of SE Asia

Growth of the Maritime Continent and its possible contribution to recurring Ice Ages

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