tr log b e o i atuan u n ap i ghilghartono.dosen.sttnas.ac.id/files/2017/12/temu-12... ·...

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.