bài giảng thạch luận các đá magma -hoạt động magma liên quan đến điểm nóng lục địa

Hoạt động magma liên quan đến điểm nóng lục địaCác tỉnh thạch học lớn Large Igneous Provinces - LIPs Kimberlit và lamprroit Columbia River Basalts at Hat Point, Snake River area.. Hoạt đ

Hoạt động magma liên quan đến điểm nóng lục địa

Các tỉnh thạch học lớn (Large Igneous Provinces - LIPs)

Kimberlit và lamprroit

Columbia River Basalts at Hat Point, Snake River area

Cover of Geol Soc Amer Special Paper 239 Photo courtesy Steve Reidel.

1 – Yakutian, 2 – Arkhangelsk, 3 – East China, 4 – North Australia, 5 – South Africa,

6 – Central Africa, 7 – West Africa, 8- Brazil, 9 – Venezuela GRB –Rio Grande

basalts, NATB – North-Atlantic Tertiary basalts (modified from Pirajno, 2003)

Parana

GRB

Yellowstone Wrangellina

Tristan Louisville

Iceland

NATB

Siberian

Balleny Kergulen

Hess

Marion

8910

567

12

Hoạt động magma rift lục địa (rift cổ và trẻ) Basalt lũ (phủ tràn lục địa - trap)

Kimberlit và lamprroit

Figure 15-2 Flood basalt provinces of Gondwanaland prior to break-up and separation After Cox (1978) Nature, 274, 47-49

Figure 15-3 Relationship of the Etendeka and Paraná plateau provinces to the Tristan hot spot After Wilson (1989), Igneous Petrogenesis Kluwer.

CÁC TỔ HỢP MAGMA CỦA RIFT LỤC ĐỊA

Loạt phonolit và bazanit

Bazan kiềm – trachyt

Bazan - riolit

CÁC TỔ HỢP MAGMA KIỂU TRAP

Geologic map of the NW Siberian Platform showing distribution of Paleozoic

sediments and Siberian flood-volcanic rocks in the Maymecha-Kotuy and Noril’sk areas East of these areas are Proterozoic sedimentary rocks and Archean gneisses of

the Anabar Shield In quadrangles are sample locations for zircon dating

J-K sidementaryrocks

Ptz sedimentaryrocks1

Studied samples ofvolcanic rocksStudied samples ofthe Noril’sk intrusion

Studied sample ofthe Bolgakhtokh intrusion

the first stage P-T volcanic rocks

21

Ar-Ptz gneisses ofthe Anabar Shield

1

Є-P sidementaryrocks

Legend

TrapsBasalts, dike complexes of basites & alkaline basites

Deposits

Cu-Ni-Pt Ni-Co-As

Hg and Au-Hg Cu-Mo porphyry

Figure 15-6 Variation in wt.% of selected major element oxides vs Mg# for units of the Columbia River Basalt Group Winter (2001) An Introduction

to Igneous and Metamorphic Petrology Prentice Hall Data from BVTP (Table 1.2.3.3), Hooper (1988a), Hooper and Hawkesworth (1993)

Figure 15-7 Condrite-normalized rare earth element patterns of some typical CRBG samples Winter (2001)

An Introduction to Igneous and Metamorphic Petrology Prentice Hall Data from Hooper and Hawkesworth

(1993) J Petrol., 34, 1203-1246

Figure 15-8 N-MORB-normalized spider diagram for some representative analyses from the CRBG Winter (2001) An

Introduction to Igneous and Metamorphic Petrology Prentice Hall Data from Hooper and Hawkesworth (1993) J Petrol.,

34, 1203-1246 Picture Gorge from Bailey (1989) Geol Soc Amer Special Paper, 239, 67-84

Figure 15-9 OIB-normalized spider diagram for some representative CRBG analyses Winter (2001) An Introduction to Igneous and Metamorphic Petrology Prentice Hall (data as in Figure 15-8)

Figure 15-11 87 Sr/ 86 Sr vs 143 Nd/ 144 Nd for the CRBG Winter (2001) An Introduction to Igneous and Metamorphic

Petrology Prentice Hall Data from Hooper (1988a), Carlson et al (1981), Carlson (1984), McDougall (1976), Brandon et al (1993), Hooper and Hawkesworth (1993)

Figure 15-11 208 Pb/ 204 Pb vs 206 Pb/ 204 Pb for the basalts of the CRBG Included for reference are EMI, EMII, the DUPAL group, the MORB array, and the NRHL (northern hemisphere reference line) connecting DM and HIMU mantle reservoirs from Figure 14-6 Winter (2001) An Introduction to Igneous and Metamorphic Petrology

Prentice Hall Data from Hooper (1988a), Carlson et al (1981), Carlson (1984), McDougall (1976), Brandon et al

(1993), Hooper and Hawkesworth (1993)

Figure 15-14 Diagrammatic cross section illustrating possible models for the development of continental flood basalts DM is the depleted mantle (MORB source reservoir), and the area below 660 km depth is the less depleted, or enriched OIB source reservoir Winter (20010 An Introduction to Igneous and Metamorphic Petrology Prentice Hall.

Isotope ages of Song Da komatiite

Distribution of REE in basalt association of Song Da rift, Emeishan and Siberian traps, normalized to chondrit

komatiite-(Sun&M.Donough, 1989)

Spider-diagramm for

komatiite-basalt association of Song Da rift,

Emeishan and Siberian traps,

normalized to PM (Sun

&M.Donough, 1989)

Spider-diagramm of NW Song Da High-Ti basalts in comparision with Emeishan’s

Spider-diagramm of SE Song Da

High-Ti basalts in comparision

with Emeishan’s

KIMBERLIT VÀ LAMPROIT

 VỊ TRÍ KIẾN TẠO:

 Kimberlit thường ở trong craton (trong nền);

 Lamproit thường đặc trưng cho các đai động ven nền.