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Hydrothermal Alteration 103Kaolinization 1° 4Thermal (Contact) Metamorphism 104Regional Metamorphism 105Chapter 9 Superficial Geology 107Introduction 107Onshore Superficial Deposits 107Classification and Distribution 107Alluvium 108Details 110Slope Deposits 111Details 112Talus (Rockfall Deposits) 115Details 115Beach Deposits 115Details 116Intertidal Deposits 117Details 118Offshore Superficial Deposits 118Classification and Distribution 118Pre-Chek Lap Kok Formation Deposits 122Details 122Age and Sedimentary Environment 122Chek Lap Kok Formation 122Details 124Age and Sedimentary Environment 124Sham Wat Formation 127Details 130Palaeontology 130Age and Sedimentary Environment 132Channel And Transgressive Deposits 132Details 133Age and Sedimentary Environment 133Hang Hau Formation 134Details 138Age and Sedimentary Environment 141Weathered Rocks and Sediments 142
Chapter 10 Economic Geology 149Introduction and Classification 149Metalliferous Minerals 149Non-metalliferous Minerals 151Construction Materials 151References 153Appendices1 Microfossils Identified from the Carboniferous Mai Po Member by China 159Corelab (CC) Shenzhen & Guangdong Institute of Geological Sciences (GIGS)2 Selected Whole-rock Geochemical Analyses of Igneous Rocks in the District 1603 Microfossils Identified from Mesozoic Mudstones by Guangdong Institute of 164Geological Sciences (IGS)4a Selective Normalized Palynology Plot of Borehole A5/1 1654b Selective Normalized Palynology Plot of Borehole ESC 17 1665 Radiocarbon Dates in Offshore Superficial Deposits 167Index 168List of Tables1 Grain Size Description and Classification of Rocks and Superficial Deposits 13in Hong Kong2 Solid Rocks and Superficial Deposits of the District 233 Evolution of Nomenclature of Volcanic Successions in the Territory 37List of Figures1 Principal Topographic Features of the District 162 Traverses Undertaken During Field Survey of the District 183 Location of Seismic Reflection Survey Tracks within the District 204 Location of Boreholes and Cone Penetration Tests in the District 215 Simplified Solid Geology of the District 226 Bouguer Gravity Anomaly Contour Map of the District 287a Classification of Pyroclastic Rocks Based on Composition (after LeMaitre 1989) 387b Classification of Pyroclastic Rocks Based on Grain Size (Adapted from Schmid, 381981 and Fischer & Schminke, 1984)8 General Classification and Nomenclature of Major and Minor Intrusive Rocks 61(after Streckeisen, 1974)9 Main Faults in the Vicinity of Hong Kong 9510 Main Faults in the District, Inferred from All Data Sources 9811 The Distribution of Onshore and Offshore Superficial Deposits in the District 10812 Schematic Section Relating Onshore to Offshore Superficial Deposits 10913 Subcrops of Pre-Chek Lap Kok Formation Deposits and Sham Wat Formation, 123and Locations of Boreholes A5/1, A5/2, B2/1, B15 and ESC17, ContainingType, and Other Sections Through Offshore Superficial Deposit Formations.14 Geological Log of Borehole ESC 17, with Sham Wat Formation Type Section 126
Page 2 and 3: UNIVERSITY OF HONG KONGLIBRARIES
Page 4 and 5: © Government of Hong KongPublished
Page 7 and 8: CONTENTSTitle pagePage1ForewordCont
Page 9: Distribution and Lithology 73Detail
Page 13 and 14: (Plates)Plate 22 - Porphyritic Medi
Page 15: Table 1 — Grain Size Description
Page 18 and 19: 0 1 2 3 4 5 k mCONTOURS AT 100m INT
Page 20 and 21: properties of the marine deposits b
Page 22 and 23: Archival DataAll records from the s
Page 24 and 25: Chapter 2Outline of GeologyThe soli
Page 26 and 27: The Mesozoic volcanic rocks are div
Page 29 and 30: Chapter 3Palaeozoic Sedimentary Roc
Page 31 and 32: Carboniferous metasedimentaiy rocks
Page 33 and 34: Plate 1 - Fining-Upward Sequence of
Page 35 and 36: Plate 3 - Well-bedded Sandstones an
Page 37 and 38: Reef Island. The northern end of th
Page 39 and 40: Table 3. Evolution of Nomenclature
Page 41 and 42: are crudely stratified and welded i
Page 43 and 44: Shing Mun FormationThe type localit
Page 45 and 46: Tai Che Tung. Crystal tuff, interpr
Page 47 and 48: Plate 7 • Lapilli-Ash Crystal Tuf
Page 49 and 50: Plate 11 - Pyroclastic Breccia (086
Page 51 and 52: appears fragmental, and contains mu
Page 53 and 54: exposures in the stream bed consist
Page 55 and 56: Lin Fa Shan. The steep eastern flan
Page 57 and 58: dipping northwest at 46°, is prese
Page 59 and 60: Sunset Peak MemberThe Sunset Peak M
Page 61 and 62:
Plate 16- Block and Lapilli-bearing
Page 63 and 64:
Chapter 5Major IntrusionsClassifica
Page 65 and 66:
in grain size from 0.4 to 1.5 mm, a
Page 67 and 68:
20 - Megacrystic Medium-grained Gra
Page 69 and 70:
Pui O Wan. Porphyritic medium-grain
Page 71 and 72:
minimum age of c. 145 Ma (see earli
Page 73 and 74:
The granite on Chek Lap Kok is most
Page 75 and 76:
Southeast of Tin Sam, on the wester
Page 77 and 78:
About 1 km east of Nam Shan, exposu
Page 79 and 80:
Plate 25 - Thin Section of Porphyri
Page 81 and 82:
Chapter 6Minor IntrusionsIntroducti
Page 83 and 84:
The microgranite grades southwards
Page 85 and 86:
the Lantau Formation, however, and
Page 87 and 88:
Plate 29 - Flow-banded Quartzphyric
Page 89 and 90:
also cut volcanic rocks of the Tsue
Page 91 and 92:
Silver Mine Bay. On the headland so
Page 93 and 94:
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 146 and 147:
Boreholes (A5/1, A5/2, B2/1, ESC17
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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