chap04 - Chapter 4 Igneous Rocks Geology 11 Principles of...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 4 Igneous Rocks Geology 11 – Principles of Geology A. M. P. Tengonciang National Institute of Geological Sciences University of the Philippines, Diliman
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4.1 What is magma? ± A high-temperature (generally >900 K), multiphase ± Solids: oxide & silicate crystals; rock inclusions ± Liquid: silicate (O-Si-Al-Ca-Mg-Fe-K-Na) or carbonatitic (>50 wt% carbonate) ± Vapor: H-O-C-S-Cl-rich gas; supercritical fluid Common types of magma ± Basaltic (basic) ± ± ~25 km 3 /yr is generated, erupted & emplaced primarily along diverging plate boundaries ± Rhyolitic (silicic) ± <1 km 3 /yr is erupted, mainly in continental environments ± Some rhyolitic & intermediate magmas stagnate at depth, forming plutons; associated with subduction zones ± Volcanic gas species ± H 2 O. CO 2 , SO 2 , H 2 S, SO 3 , CO, COS, CH 4 , HCl, HF, H 2 , O 2 , N 2 , CS 2 , NH 4 , B, Br
Background image of page 2
4.1 Common types of magmas 1-6 wt% 0.2-2 wt% Volatiles (H s O, CO 2 ) 1 W/m K 0.6 W/m K Thermal conductivity * 500,000 (1.2 x 10 10 ) 100 Viscosity * , Pa s 1450 1450 Specific heat * , J/kg K 2260 (2350) 2600 Density * , kg/m 3 250 400 Heat of fusion, kJ/kg 3-5 % 3 % Na 2 O + K 2 O 10% MgO 10% FeO 12% CaO 13% 15% Al 2 O 3 75 wt% 50 wt% SiO 2 750-1000°C 1000-1300°C T eruption Rhyolitic Basaltic * Typical values for basaltic magmas at 1200°C, low pressure; rhyolitic magmas with 2 wt% dissolved H 2 O at 900°C, low pressure; values in parentheses describe water-free magmas
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4.2 Origin & formation
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/20/2010 for the course LIR 30 taught by Professor Thornley,k during the Spring '08 term at Santa Rosa.

Page1 / 9

chap04 - Chapter 4 Igneous Rocks Geology 11 Principles of...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online