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Journal of the Geological Society

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Discussion on structural evolution of Mesozoic Peninsular Malaysia

W. Altermann writes: In their discussion of palaeotectonics and palaeogeography of Malay Peninsula, Harbury et al. propose an alternative interpretation to ªengör's (1984) model of Triassic or early Jurassic collision of the Cimmerian (Sibumasu) block with the Indochina block in the east. Their interpretation depicts Malay Peninsula as part of Triassic and lower Jurassic Australian Gondwana. The Raub Bentong Fault Zone is considered as having originated through the Permo-Triassic southward destruc- tion of ‘Tethys Ocean 11’ underneath the Malay Peninsula. For the Triassic this zone is described as a normal fault (see figs 11-13, Harbury et al.).

The Raub Bentong Zone, however, is generally accepted to be the southern extension of the Nan-Uttaradit suture in north Thailand (see Harbury et al., fig. 2). This suture was described by Macdonald & Barr (1984) as having a volcanic arc setting. Macdonald et al. (1985) reported crossite blueschists associated with ultramafic and mafic rocks from this suture. Barr & Macdonald (1987) identified type I1 ophiolites, formed by a spreading process above a subduction zone in this suture, and also reported a K-Ar metamorphic age of 269 f 12 Ma for the crossite schists. Helmcke (1985) reported a K-Ar age of 344 f 22 Ma for the ultramafic and mafic rocks included in the suture. None of these references are cited in the palaeogeographic dis- cussion by Harbury et al.

Helmcke (1983, 1985, 1986a, 1986b), Helmcke & Kraikhong (1982), Helmcke & Lindenberg (1983) and Altermann (1983, 1986, 1987, 1989), Altermann et al. (1983), Winkel

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