Petroleum Geology : Did the Northwest Borneo Trough terminate at the West Baram Line

Jun 30th, 2015
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It is widely accepted that the Northwest Borneo Trough represents a now extinct plate margin and that it was an active trench during spreading of the South China Sea marginal basin, from anomaly 11 (31 Ma, Oligocene) to anomaly 5c (16 Ma, Middle Miocene). The Mount Kinabalu pluton cooled through the temperature range 500° to 300° C during the interval

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Paper for Petroleum Geology 2002 conferenceDid the Northwest Borneo Trough terminate at the West Baram Line what do the Miocene adakites/diorites indicate?Charles S. Hutchison10 Lorong 5/19A; 46000 Petaling JayaSelangor, MalaysiaAbstractIt is widely accepted that the Northwest Borneo Trough represents a now extinct plate margin and that it was an active trench during spreading of the South China Sea marginal basin, from anomaly 11 (31 Ma, Oligocene) to anomaly 5c (16 Ma, Middle Miocene). The Mount Kinabalu pluton cooled through the temperature range 500 to 300 C during the interval 13.7 to 10.0 Ma and, as a result of uplift tectonics, is related to activity at the Northwest Borneo Trough. Its actual emplacement age (> 13.7, Middle Miocene) cannot be determined because it was a slow-cooling pluton. In no way does it represent a volcanic arc, which lies farther to the southeastthe Cagayan Ridge through Sandakan (Hutchison et al., 2000). All tectonic models show the Trough terminating at the West Baram Line, with total silence about what might have happened westwards of this Line. The models of Sarawak have ignored the existence of the Miocene Sintang Suite sub-volcanic arc, which extends through Kuching and Bau south-south-easterly along the length of the Ketungau Basin in Kalimantan (Fig. 1). This arc indicates that the Northwest Borneo active trench continued westward and did not terminate at the West Baram Line. Table 1 shows all accretionary prism an

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