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Foliation in granite promotes the rate of weathering Comments Relict quartz veins in weathered granite The Tsing Shan Granite is deeply weathered with the development of numerous erosion gullies. This is unusual when compared to other granitic terrains in Hong Kong where spheroidal/onion-skin weathering and the development of corestones are characteristic weathering features. In the Tsing Shan area, chemical weathering is dominant. The minerals in the rocks are altered and therefore their resistance to erosion has been greatly reduced. An area of deep weathering, closely related to the structural history of the granite has developed. The granite is sheared and deformed (schistose), causing weakening of the rock and an increased potential for weathering. The seasonal heavy rainfall is the major cause of formation of erosion gullies. Moreover, the rate of erosion appears to be rapid. The road leading to the peak, which was constructed in 1992 – 93, has been cut through by erosion gullies in less than 10 years. References Fyfe, J.A., Shaw, R., Campbell, S.D.G., Lai, K.W. & Kirk, P.A. 2000. The Quaternary geology of Hong Kong. Geotechnical Engineering Office, Hong Kong SAR Government, 209 p. plus 6 maps. Harris, R. 1984. Rotten relics rule resudual regoliths, Hong Kong. Geological Society of Hong Kong Newsletter, v. 2, no. 1, pp 1 - 7. Langford, R.L., Lai, K.W., Arthurton, R.S. & Shaw, R. 1989. Geology of the Western New Territories: 1:20 000 Sheets 2, 5 and 6. Hong Kong Geological Survey Memoir No. 3, Geotechnical Control Office, Civil Engineering Services Department, Hong Kong, 140 p. Ng, S.L. & Lam, K.C. 2002. Hong Kong’s Classic Geology No. 3: Rain erosion, 141
piping, rilling and gullying. Hong Kong Geologist, v. 18, pp 42 – 44. Ruxton, B.P. & Berry, L. 1957. The weathering of granite and associated erosional features in Hong Kong. Bulletin of the Geological Society of America, Vol. 68, pp 1263-1292. Ruxton, B.P. & Peart, M.R. 1990. Polygonal hill ridges on weathered granite in Hong Kong. Geological Society of Hong Kong Newsletter, v. 8, no. 2, pp 2 - 15. Sewell, R.J. & Campbell, S.D.G. 1997. Geochemistry of coeval Mesozoic plutonic and volcanic suites in Hong Kong. Journal of the Geological Society, Vol. 154, pp 1053–1066. Sewell, R.J., Campbell, S.D.G., Fletcher, C.J.N., Lai, K.W. & Kirk, P.A. 2000. The Pre-Quaternary Geology of Hong Kong. Geotechnical Engineering Office, Civil Engineering Department, The Government of the Hong Kong SAR, 181 p. Shaw, R. 1995. Granite weathering and deep weathering profiles. Hong Kong Geologist, v. 1 (Autumn), pp 88 - 92. Shaw, R. 1997. Variations in sub-tropical weathering profiles over the Kowloon Granite, Hong Kong. Journal of the Geological Society, London, v. 154, Part 6, pp 1077-1085. 142
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Hong Kong Geology Guide Book
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Hong Kong Geology Guide Book Geotec
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FOREWORD Despite having a relativel
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Table of Contents Page Preface 1 Fo
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21. Power of Weathering - Erosion T
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Plover Cove Reservoir, Northeast Ne
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Outline of the Geology Geological M
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Conglomerate overlying horizontally
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Bureau of Geology and Mineral Resou
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How to Get There The Permian sedime
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Guide to Field Observations Because
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Comments Outcrops of Permian rocks
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Kau San Tei, Tai O, Lantau Island I
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ock make up 95% of the Formation. I
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Sediments infilling a groove - tran
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Lai Chi Chong, East New Territories
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Footpath from Pak Sha O to Lai Chi
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Guide to Field Observations The opt
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Newsletter, v. 4, pp 1-4. Sewell, R
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Outline of the Geology Exposures of
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Formation Rock Type Depositional En
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East Ping Chau, Eastern New Territo
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The dolomitic siltstone, particular
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Study of the rock outcrops, particu
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Tai Shek Mo, Lo Wu, Northern Territ
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contact with the Jurassic Tai Mo Sh
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Comments In addition to extensive e
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Tsing Shan Monastery, Tuen Mun, Wes
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Ling Tao Monastery is best reached
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and may have been formed by small-s
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these outcrops stand out prominentl
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References Rock cores with marble c
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Ho Tin Tsuen Service Reservoir, Tue
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Brecciated andesite near Tuen Mun N
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contains very few brecciated clasts
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Shek Lung Kung, Tsuen Wan Chapter 1
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with some quartzite or chert debris
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Comments The Repulse Bay Formation,
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Tai Mo Shan, New Territories Introd
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and quartz, with minor biotite mica
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taken on rock outcrops, and not on
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Nei Lak Shan, Ngong Ping, Lantau Is
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which crop out on the lower part of
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are represented by faults, which su
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Silverstrand Bay / HKUST, Sai Kung,
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Welded tuff, eastern side of Silver
Page 93 and 94: Comments During the geological surv
Page 95 and 96: Cape Collinson Road, Siu Sai Wan, H
Page 97 and 98: Tuff-breccia (1) Tuff-breccia (2) T
Page 99 and 100: References Allen, P. M. & Stephens,
Page 101 and 102: Outline of the Geology Access to Lu
Page 103 and 104: Water Bay Formation, Kau Sai Chau V
Page 105 and 106: pp 1053-1066. Sewell, R.J., Campbel
Page 107 and 108: Outline of the Geology Access to th
Page 109 and 110: 1) At the base of many of the rock
Page 111 and 112: plus 14 plates & 3 maps. Fisher, R.
Page 113 and 114: lapilli crystal tuff of the Jurassi
Page 115 and 116: Mafic dyke with xenoliths of quartz
Page 117 and 118: Evolution of a headland, and the fo
Page 119 and 120: Sham Shui Kok, Lantau Introduction
Page 121 and 122: Geological map of Sham Shui Kok (fr
Page 123 and 124: within the feldsparphyric rhyolite,
Page 125 and 126: Sketch of Phase II dykes at Penny
Page 127 and 128: Li, X.C., Sewell, R.J. & Fletcher,
Page 129 and 130: How to Get There Buses from Tung Ch
Page 131 and 132: Joint pattern in Tong Fuk Quartz Mo
Page 133 and 134: and the Lion Rock Suite. A total of
Page 135 and 136: How to Get There The type locality
Page 137 and 138: Pegmatite vein formed in the pluton
Page 139 and 140: References Allen, P. M. & Stephens,
Page 141 and 142: in the properties and appearance of
Page 143: emains of weathering profiles becom
Page 147 and 148: pace for about half an hour. Pyrami
Page 149 and 150: Stacked stones covering a valley Er
Page 151 and 152: “Broken tortoise head” should b
Page 153 and 154: Lam Tsuen Valley, Tai Po, New Terri
Page 155 and 156: Outline of the Geology The Lam Tsue
Page 157 and 158: (Looking southwestward toward Lam T
Page 159 and 160: References Addison, R. 1986. Geolog
Page 161 and 162: Sha Tin, Ma On Shan, East New Terri
Page 163 and 164: silicon and aluminium selectively t
Page 165 and 166: open mining platform, which is loca
Page 167 and 168: Appendix I Outline History and Geol
Page 169 and 170: 500 m in a NE-SW orientation at an
Page 171 and 172: haulage drive at the 110 m level. T
Page 173 and 174: Current condition of Ma On Shan min
Page 175 and 176: Mineral Origin and Occurrence Hardn
Page 177: Mineral Origin and Occurrence Hardn
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