GEOLOGY OF THE PENGKALAN HULU-BETONG TRANSECT ...

More documents

Recommendations

Info

40 West metre 210 200 190 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 East No exposure Highly to completely weathered argillaceous limestone, relict of foliated texture still intact Highly weathered, fine-grained foliated tuff Highly weathered, foliated argillaceous limestone Highly weathered, fine grained foliated tuff Foliated lithic tuff with dark grey argillaceous rock fragments No exposure Dark grey, well foliated with kink bands, argillaceous limestone Trilobites and brachiopods fossils Figure 27: Stratigraphic sequence of the Gerik Formation (Pgk) exposed at Kampung Batu 2, Gerik
Small amounts of interbedded sedimentary rocks are also included in the tuff and possible slumping of included shale and greywacke are also recorded. Tuffaceous rocks containing lenticular bodies of dark grey impure limestone as observed in the Gerik area is also considered as part of the Gerik formation (Pgk). Minor crystal tuff only exposed around the Kuala Rui area in the southeastern part of the Transect area was also observed. It is greenish in colour, medium- to coarse-grained with euhedral quartz and pinkish to white prismatic K-feldspar phenocrysts. The hand specimen of this rock may be mistakenly identified as altered granite under the naked eye, but in the thin section (microscopic study), it does not show any granite characteristics. In general, the crystal tuff is composed of grains and crystal fragments of quartz, K-feldspar, perthitic feldspar, and plagioclase feldspar, up to 5 mm in size, set in a fine-grained or cryptocrystalline matrix of quartz, mica, and chlorite. Age and correlation Jones (1970) suggested that the age of Grik tuff (now Gerik formation) might be Late Ordovician. Burton (1986) interpreted the age of the Grik tuff as Middle Ordovician. However, Middle Ordovician to Early Silurian age was thought to be more probable for this pyroclastic rock. During recent field check, fossils of Anisopyge and Phillipsia (trilobite) and Chonetid (brachipod) were found in the calcareous shale interbedded with tuff and dark grey impure limestone at Kampung Batu 2, Gerik (05 0 27′ 36″ N, 101 0 08′ 00″ E). The presence of Anisopyge sp. and Phillipsia sp. (trilobite) strongly indicates Middle Permian age of the clastic sediments (Mohd Shafeea Leman, Pers. Comm.). Thus, this finding suggests the age of the Gerik formation (Pgk) is not older than Carboniferous, which disqualifies the interpretation on the age of the Grik tuff as Middle Ordovician-Early Silurian by Jones (1970) and Burton (1986). Furthermore, their interpretations were solely based on lithological correlation (without any fossil evidence). Fragments of brachiopod spines were also observed in the thin section of the limestone from the abandoned Bukit Jagor quarry (05 0 25′ 31″ N, 101 0 09′ 02″ E). 1mm I A II 1cm Figure 28: Photographs of fossils found in the Gerik formation (Pgk), Malaysia. A- Trilobite belongs to Anisopyge sp. (I) and Phillipsia sp. (II) along the road-cut at Kampung Batu 2, Gerik. B- Brachiopod found near the border road. B 41
Page 5 and 6: GEOLOGY OF THE PENGKALAN HULU-BETON
Page 7 and 8: PREFACE This report together with t
Page 9 and 10: Geology of the Pengkalan Hulu-Beton
Page 11: granite (Trgrbp/pr) and Kawi granit
Page 14 and 15: x LIST OF FIGURES Page Figure 1: Lo
Page 17 and 18: 1. INTRODUCTION The Malaysia-Thaila
Page 19 and 20: On the Thai side, detailed systemat
Page 21 and 22: Basir Jasin (1995) reported the occ
Page 23 and 24: Permian as indicated by the presenc
Page 25 and 26: Central - North Peninsular Malaysia
Page 27 and 28: The Permian Ratburi Group (Prb), un
Page 29 and 30: Figure 5: General succession of the
Page 31 and 32: Era CENOZOIC MESOZOIC P A L A E O Z
Page 33 and 34: strong isoclinal folding, faulting,
Page 35 and 36: A B Figure 8: Argillaceous facies o
Page 37 and 38: Fossils and age According to the ea
Page 39 and 40: metaconglomerate occurs in the uppe
Page 41 and 42: The lower part of the formation is
Page 43 and 44: Figure 14: Stratigraphic sequence o
Page 45 and 46: A Figure 16: Photographs showing th
Page 47 and 48: the banks of small rivers and strea
Page 49 and 50: Figure 18: Stratigraphic sequence o
Page 51 and 52: A C Figure 20: Photographs of the u
Page 53 and 54: Lithology The Tham Krachaeng format
Page 55: 3.1.4 The Gerik formation (Pgk) The
Page 59 and 60: Depositional environment Based on t
Page 61 and 62: nomenclature of the Nenering beds (
Page 63 and 64: A B Figure 33: Exposures of the Nen
Page 65 and 66: A B Figure 35: Outcrop of Basal Gra
Page 67 and 68: The rock sequence of the Nenering b
Page 69 and 70: 3.3.1 Rimba Telui/Si Nakhon granite
Page 71 and 72: 3.3.2 Bintang granite (Trgrbt) Dist
Page 73 and 74: A B Figure 41: The Chantharat grani
Page 75 and 76: intrusion of the granitoids mention
Page 77 and 78: The Silurian-Devonian rock sequence
Page 79 and 80: 5.2 Metallic Minerals The occurrenc
Page 81 and 82: arsenopyrite and grossularite are c
Page 83 and 84: British American Tin Mines Company
Page 85 and 86: 5.3 Non-Metallic Minerals and Hot S
Page 87 and 88: Figure 50: Limestone quarry at Buki
Page 89 and 90: Ban Bor Nam Ron, 9 km north of Beto
Page 91 and 92: well-cemented, poorly sorted matrix
Page 93 and 94: Foo, K.Y., 1990. Geology and Minera
Page 95 and 96: Sashida, K., Nakornsri, N., Ueno, K
Page 97 and 98: Appendix 1: List of the Malaysian W
Page 99 and 100: Appendix 3: XRD analysis results fo

GEOLOGY OF THE PENGKALAN HULU-BETONG TRANSECT ...

Create successful ePaper yourself

Delete template?

Save as template?