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Civil Engineering Department, The Government of the Hong Kong SAR, 181 p. Smith, R.L. 1979. Ash-flow magmatism. Geological Society of America Special Paper No. 180, pp 5 – 27. Strange, P.J. 1992. Discussion on the geological age of the Repulse Bay Formation, Hong Kong. Geological Society of Hong Kong Newsletter, v. 10, no. 1, p. 26. Strange, P.J., Shaw, R. & Addison, R. 1990. Geology of Sai Kung and Clear Water Bay. Hong Kong Geological Survey Memoir No. 4, Geotechnical Control Office, Civil Engineering Services Department, Hong Kong, 111 p. Workman, D.R. 1983. Field description of pyroclastic rocks. Geological Society of Hong Kong Newsletter, v. 1, no. 2, pp 3 – 6. 91
Cape Collinson Road, Siu Sai Wan, Hong Kong Island Chapter 14 – Tuff-breccia and Rhyolitic Crystal Tuff – Che Kwu Shan Formation (II) Introduction The Che Kwu Shan Formation, part of the Repulse Bay Volcanic Group, was considered to have been deposited by a hot rhyolitic volcanic ash flow (Sewell et al., 2000). In addition to a streaked appearance that resulted from welding of the very hot crystal ash particles, the Formation also comprises a large volume of tuffbreccia. Along the eastern side of Hong Kong Island, tuff-breccia and rhyolitic crystal tuff are common in coastal outcrops to the east of Cape Collinson Road, Siu Sai Wan. These various rock types were previously assigned to the Shing Mun Formation by Strange & Shaw (1986). However, based on U-Pb isotope age dating, major and trace element geochemistry, petrographic properties and stratigraphic relationships, Campbell & Sewell (1997) later defined the Che Kwu Shan Formation, which mainly crops out in the vicinity of the Clear Water Bay peninsula. However, the Geological reconnaissance map of Cape Collinson outcrops near the Cape Collinson Correctional Institution appear to differ in several respects from those at Silverstrand Bay, Clear Water Bay peninsula, which have been assigned to the same Formation. The differences may be due to variations in depositional processes during volcanic eruption. How to Get There The rocks of the Che Kwu Shan Formation are well-exposed along the coast to the north of the Cape Collinson Correctional Institution. However, the rock cliffs are very 92
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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
Page 43 and 44: East Ping Chau, Eastern New Territo
Page 45 and 46: The dolomitic siltstone, particular
Page 47 and 48: Study of the rock outcrops, particu
Page 49 and 50: Tai Shek Mo, Lo Wu, Northern Territ
Page 51 and 52: contact with the Jurassic Tai Mo Sh
Page 53 and 54: Comments In addition to extensive e
Page 55 and 56: Tsing Shan Monastery, Tuen Mun, Wes
Page 57 and 58: Ling Tao Monastery is best reached
Page 59 and 60: and may have been formed by small-s
Page 61 and 62: these outcrops stand out prominentl
Page 63 and 64: References Rock cores with marble c
Page 65 and 66: Ho Tin Tsuen Service Reservoir, Tue
Page 67 and 68: Brecciated andesite near Tuen Mun N
Page 69 and 70: contains very few brecciated clasts
Page 71 and 72: Shek Lung Kung, Tsuen Wan Chapter 1
Page 73 and 74: with some quartzite or chert debris
Page 75 and 76: Comments The Repulse Bay Formation,
Page 77 and 78: Tai Mo Shan, New Territories Introd
Page 79 and 80: and quartz, with minor biotite mica
Page 81 and 82: taken on rock outcrops, and not on
Page 83 and 84: Nei Lak Shan, Ngong Ping, Lantau Is
Page 85 and 86: which crop out on the lower part of
Page 87 and 88: are represented by faults, which su
Page 89 and 90: Silverstrand Bay / HKUST, Sai Kung,
Page 91 and 92: Welded tuff, eastern side of Silver
Page 93: Comments During the geological surv
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 and 144: emains of weathering profiles becom
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piping, rilling and gullying. Hong
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pace for about half an hour. Pyrami
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Stacked stones covering a valley Er
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“Broken tortoise head” should b
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Lam Tsuen Valley, Tai Po, New Terri
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Outline of the Geology The Lam Tsue
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(Looking southwestward toward Lam T
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References Addison, R. 1986. Geolog
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Sha Tin, Ma On Shan, East New Terri
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silicon and aluminium selectively t
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open mining platform, which is loca
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Appendix I Outline History and Geol
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500 m in a NE-SW orientation at an
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haulage drive at the 110 m level. T
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Current condition of Ma On Shan min
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Mineral Origin and Occurrence Hardn
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Mineral Origin and Occurrence Hardn
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