Table 5.1 - Summary of the volcanic–plutonic nomenclature and U–Pb age data for Mesozoic igneous rocks of Hong Kong 1, 2, 3
VOLCANIC ROCKS GRANITOID ROCKS
Group Formation U–Pb Age (Ma) Suite Intrusion U–Pb Age (Ma)
KAU SAI
CHAU
VOLCANIC
GROUP
  High Island (Kkh) 140.9 ± 0.2 LION
ROCK
SUITE
'GRANITIC'
SUBSUITE
Mount Butler Granite (Klb)  
Clear Water Bay (Kkw) 140.7 ± 0.2 Po Toi Granite (Klp)  
  140.9 ± 0.2 * Kowloon Granite (Klk) 140.4 ± 0.2
Undifferentiated (Kku) 141.1 ± 0.2 * Fan Lau Granite (Kll)  
Sok Kwu Wan Granite (Kls)  
      'MONZONITIC'
SUBSUITE
Tei Tong Tsui Quartz Monzonite (Klt)  
Tong Fuk Quartz Monzonite (Klf) 140.4 ± 0.3
D'Aguilar Quartz Monzonite (Kld) 140.6 ± 0.3 *
  140.6 ± 0.3 *
   
Unconformity
     
REPULSE
BAY
VOLCANIC
GROUP
'RHYOLITIC'
SUBGROUP
Mount Davis (Krd) 142.8 ± 0.2* CHEUNG
CHAU
SUITE
  Luk Keng Quartz Monzonite (Kcl)  
Long Harbour (Krl) 142.7 ± 0.2
  142.8 ± 0.2
'TRACHYTIC'
SUBGROUP
Pan Long Wan (Krp)   Shan Tei Tong Rhyodacite (Kct)  
Mang Kung Uk (Krm) 142.9 ± 0.2 Chi Ma Wan Granite (Kcc) <143.7 ± 0.3
Che Kwu Shan (Krc) 142.5 ± 0.3 Shui Chuen O Granite (Kcs) 144.0 ± 0.3 *
Ap Lei Chau (Kra) 142.7 ± 0.2
Ngo Mei Chau (Krn) <142.7 ± 0.1
   
Unconformity
     
LANTAU
VOLCANIC
GROUP
  Lai Chi Chong (Jll) 146.6 ± 0.2 * KWAI
CHUNG
SUITE
  Sha Tin Granite (Jkt) 146.2 ± 0.2
East Lantau Rhyolite (Jko) 146.3 ± 0.3
East Lantau Rhyodacite (Jkd) 146.5 ± 0.2
Undifferentiated (Jlu) 146.6 ± 0.2 Needle Hill Granite (Jkn) 146.4 ± 0.2
  147.5 ± 0.2 * Sham Chung Rhyolite (Jks) 146.6 ± 0.2 *
South Lamma Granite (Jkl) 148.1 ± 0.2 *
            Hok Tsui Rhyolite 151.9 ± 0.2 *
   
Unconformity
     
        LAMMA
SUITE
'A-TYPE'
SUBSUITE
Tai Lam Granite (Jma) 159.3 ± 0.3
Tsing Shan Granite (Jms) <159.6 ± 0.5
Chek Lap Kok Granite (Jmc) 160.4 ± 0.3
Chek Mun Rhyolite 160.8 ± 0.2
TSUEN
WAN
VOLCANIC
GROUP
Sai Lau Kong (Jtl) 164.1 ± 0.2 'I-TYPE'
SUBSUITE
Lantau Granite (Jml) 161.5 ± 0.2
Tai Mo Shan (Jtm) <164.6 ± 0.7
Shing Mun (Jts) 164.2 ± 0.3 * Tai Po Granodiorite (Jmt) <164.6 ± 0.2
  164.7 ± 0.3 *
Yim Tin Tsai (Jty) 164.5 ± 0.2

1 The Tuen Mun Formation, of broadly andesitic composition is excluded from this classification.
2 The Deep Bay Granite of Triassic age (Davis et al., 1997) is excluded from this classification.
3 Mnemonics are as used on 1:100 000-scale geological map (Map 1)
* Unpublished data, Geotechnical Engineering Office

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