Igenous Rocks
Examples
|
Ultramafic
Mafic
Intermediate
Felsic |
Intrisive
Dunite, BH250-41, BH250-80, BH25-112a
Gabbro, BH250-50, BH250-113, BH250-189
Diorite, BH250-90, BH250-164, BH250-176
Granite, BH250-49, BH250-92, BH250-96, BH250-152
|
Extrusive
Komatiitie, BH250-87, BH250-161
Basalt, BH250-60, BH250-82, BH250-124
Andsite, BH250-130, BH250-165
Rhyolite, BH250-72, BH250-89, BH250-95
|
Pyroclastic
--
Scoria
Pumice, Welded Tuffs ( BH250-130)
Obsidian , Tuff, BH250-108, BH250-169
|
Metamoprhic rocks
Examples
|
Foliated |
Slate, BH250-123
Phyllite, BH250-88, BH250-126, BH250-157
Schist, BH250-52, BH250-110, BH250-159
Gneiss, BH250-111, BH250-115, BH250-118
|
From Mudd to Gneiss
Mudstone -->Shale --> [ Slate -->Phyllite -->Schist -->Gneiss] |
|
| Non-foliated |
Quartzite, BH250-27, BH250-160, BH250-166
Marble, BH250-138
|
|
|
Sedimentary Rocks
Examples
|
Clastic |
Mudstone
Shale, BH250-180
Sandstone, BH250-61, BH250-69, BH250-70
Conglomerate, BH250-141, BH250-153
|
Clastic sedimenary rocks are classfied in terms of grain size
Name of Particle |
Size range |
Loose sediment |
Consolidated rocks |
Boulder |
>256 mm |
Gravel |
Conglomerate |
Cobble |
64-256mm |
Gravel |
Conglomerate |
Pebble |
2-64mm |
Gravel |
Conglomerate |
Sand |
1/16-2mm |
Sand |
Sandstone |
Silt |
1/256-1/16mm |
Silt |
Siltstone |
Clay |
<256mm |
clay |
Mudstone |
|
To learn more about variation within the sand size (see attachements 1, 2)
Conglomerates and Breccias
A clastic rock made of particles larger than 2 mm in diameter is either a conglomerate or breccia. A conglomerate has rounded clasts while a breccia has angular clasts. |
| Chemical |
Limestone, BH250-109, BH250-122
Dolostone, BH250-155, BH250-156
Oolite, BH250-179
|
|
|
|
![Mudstone -->Shale --> [ Slate -->Phyllite -->Schist -->Gneiss]](FromMudToGneiss.jpg){kind=link}
