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ETROLO
U NA P
[TGS7404]
Dr. Hill. Gendoet Hartono
Semester 7, 2017-2018
2 SKS teori
GI BA
GI
T UAN
PENDAHULUAN 1X
Berisi tentang latarbelakang, bumi, batuan beku dan
batuan gunung api, dan kedudukan di bidang geologi
TATAAN TEKTONIK 2X
Berisi tentang tektonik global, regim tektonik, dan
peranannya dalam magmatisme dan volkanisme
GENERASI MAGMA 2X
Berisi tentang magmatisme, diagram fase
KLASIFIKASI 2X
Klasifikasi magma atau afinitas magma
Rock Forming Mineral 1X
Kimia Mineral Pembentuk Batuan 1X
Petrologi Batuan Intrusi Dangkal 2X
Petrologi Batuan Ekstrusi 2X
Alterasi Batuan Gunung Api 1X
Extrusive igneous rocks form when magma
reaches the Earth's surface a volcano and cools
quickly. Most extrusive (volcanic) rocks have small
crystals. Examples include basalt, rhyolite,
andesite, and obsidian.
ADA KESINAMBUNGAN PROSES MAGMATISME, VOLKANISME DAN SEDIMENTASI SETIAP MAGMA KELUAR KE PERMUKAAN BUMI ADALAH GUNUNG API
GUNUNG API DICIRIKAN OLEH ASOSIASI CO-MAGMATIC BATUAN EKSTRUSIDGN INTRUSI
Extrusive refers to the mode of igneous volcanic rock formation in
which hot magma from inside the Earth flows out (extrudes) onto
the surface as lava or explodes violently into the atmosphere to fall
back as pyroclastics or tuff. This is as opposed to intrusive rock
formation, in which magma does not reach the surface.
The main effect of extrusion is that the magma can cool much
more quickly in the open air or under seawater, and there is little
time for the growth of crystals. Sometimes, a residual portion of the
matrix fails to crystallize at all, instead becoming a natural glass or
obsidian.
If the magma contains abundant volatile components which are
released as free gas, then it may cool with large or small vesicles
(bubble-shaped cavities) such as in pumice, scoria, or vesicular
basalt. Examples of extrusive rocks include basalt, rhyolite,
andesite, obsidian and pumice.