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Boreholes (A5/1, A5/2, B2/1, ESC17 and B15; see above) drilled through the Chek Lap KokFormation sediments show that they were mainly deposited subaerially. The effects of theirsubaerial weathering range from sporadic orange oxidation mottles and streaks, to intensiveweathering to a deep red colour and the development of nodular concretions. The latter areassociated with palaeosols on former exposed surfaces. Generally, the intensity of weatheringdecreases downwards for about 2 m> below which it is usually represented by intermittent yellowor orange brown streaks and mottles. The weathering occurred during, or soon after deposition,and prior to deposition of the overlying grey, reduced, marine muds of the Hang Hau Formation.The Sham Wat Formation is weathered to a limited extent. It still retains its grey groundmasscolour but this is superimposed with sparse orange-yellow mottles and streaks. It is also firm andrelatively dewatered, and macroscopic shells are soft and slightly corroded, suggesting subaerialexposure of the sediments.144
Plate 49 - Feldsparphyric Rhyolite Corestone Tor (176 171), Southwest ofLo Fu TauPlate 50 - Corestone Development (Spheroidal Weathering) in Fine-grained Gabbro (1999 1089), EastChi Ma Wan Peninsula
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UNIVERSITY OF HONG KONGLIBRARIES
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© Government of Hong KongPublished
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CONTENTSTitle pagePage1ForewordCont
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Distribution and Lithology 73Detail
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Chapter 10 Economic Geology 149Intr
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(Plates)Plate 22 - Porphyritic Medi
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Table 1 — Grain Size Description
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0 1 2 3 4 5 k mCONTOURS AT 100m INT
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properties of the marine deposits b
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Archival DataAll records from the s
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Chapter 2Outline of GeologyThe soli
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The Mesozoic volcanic rocks are div
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Chapter 3Palaeozoic Sedimentary Roc
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Carboniferous metasedimentaiy rocks
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Plate 1 - Fining-Upward Sequence of
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Plate 3 - Well-bedded Sandstones an
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Reef Island. The northern end of th
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Table 3. Evolution of Nomenclature
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are crudely stratified and welded i
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Shing Mun FormationThe type localit
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Tai Che Tung. Crystal tuff, interpr
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Plate 7 • Lapilli-Ash Crystal Tuf
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Plate 11 - Pyroclastic Breccia (086
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appears fragmental, and contains mu
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exposures in the stream bed consist
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Lin Fa Shan. The steep eastern flan
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dipping northwest at 46°, is prese
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Sunset Peak MemberThe Sunset Peak M
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Plate 16- Block and Lapilli-bearing
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Chapter 5Major IntrusionsClassifica
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in grain size from 0.4 to 1.5 mm, a
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20 - Megacrystic Medium-grained Gra
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Pui O Wan. Porphyritic medium-grain
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minimum age of c. 145 Ma (see earli
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The granite on Chek Lap Kok is most
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Southeast of Tin Sam, on the wester
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About 1 km east of Nam Shan, exposu
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Plate 25 - Thin Section of Porphyri
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Chapter 6Minor IntrusionsIntroducti
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The microgranite grades southwards
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the Lantau Formation, however, and
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Plate 29 - Flow-banded Quartzphyric
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also cut volcanic rocks of the Tsue
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Silver Mine Bay. On the headland so
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Plate 33 - Core stone Development i
Page 95: Plate 37 - Thin Section ofLamprophy
Page 98 and 99: Pre-Yensfaanlan StructureWithin the
Page 100 and 101: separates areas of different lithol
Page 102 and 103: NeotectonicsFault activity in the r
Page 105 and 106: Chapter 8Metamorphism and Alteratio
Page 107 and 108: the majority of rocks in the distri
Page 109: Chapter 9Superficial GeologyIntrodu
Page 112 and 113: Detailstal O. Alluvial deposits for
Page 114 and 115: trains. The regolith on most steep
Page 116 and 117: Plate 44 - Boulder Debris on the So
Page 118 and 119: gazetted for recreational purposes.
Page 120 and 121: DetailsTai O. Extensive intertidal
Page 122 and 123: Plate 48 - Sandy Beach at Fan Lau S
Page 124 and 125: Pre-Chek Lap Kok Formation Deposits
Page 126 and 127: formation. The sequence is usually
Page 128 and 129: BOREHOLE NO: ESC 17GRID REFERENCE:
Page 130 and 131: BOREHOLE NO: A5/1GRID REFERENCE: 80
Page 132 and 133: formation, thinly laminated clays o
Page 134 and 135: Quinqueloculina seminulum, which is
Page 136 and 137: Channel and Transgressive Deposits.
Page 138 and 139: Figure 20 - Areas of Acoustic Turbi
Page 140 and 141: West Lamma Channel These may be att
Page 142 and 143: Figure 23 - Depth-Averaged, Maximum
Page 144 and 145: The formation is Holocene in age. T
Page 148 and 149: Plate 51 - Deep Weathering Profile
Page 151 and 152: Chapter 10Economic GeologyIntroduct
Page 153 and 154: Non-metalliferous MineralsFissure v
Page 155 and 156: REFERENCESAddison, R. (1986). Geolo
Page 157 and 158: James, J.W.C. (1993). The offshore
Page 159 and 160: Sewell, R.J., Strange, PJ., Langfor
Page 161 and 162: Appendix 1Microfossils identified f
Page 163 and 164: Appendix 2 (continued)Sample HK9913
Page 165 and 166: Appendix 2 (continued)Sample HK1054
Page 167 and 168: Appendix 4aSelective normalized pal
Page 169 and 170: ,Appendix 5 -Radiocarbon and Other
Page 171 and 172: construction materials 151contact m
Page 173 and 174: molybdenite 149Mong Tung Hang 151Mo
Page 175 and 176: talus 107,115Tarn Tsui Wan 71,87Tan
Page 177: LB 555.125 G34 LGeology of Lantaii
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