Mississipi Valley Type Deposit

8/11/2019 Mississipi Valley Type Deposit

1/26

MISSISSIPPI VALLEY TYPE(MVT) DEPOSIT


2/26


3/26

Sejarah MVT Amerika Utara(Galena ,Sphalerite,sedikit Kalkopirit )

Banyak ditemukan terbentuk di waktu

PROTEROZOIKUM - CRETACEOUS

Pertama kali ditemukan 70

tahun yang lalu (Bastian 1939)


4/26

Apa sih MVT (Mississippi Valley

Type) itu ?

Endapan MVT terdiri dari kumpulan tubuh bijih dimana silfida Fe, Pb, dan Zn mengisi

rongga pada termokarst atau larutan breksia pada platform karbonat kebagian

cekungan sedimen

Ukuran rata rata Deposit7.0 Mt

32,5 g/t

Ag0.23 %

Cu

6,0 %

Zn

1.9 %

Pb


5/26


6/26


7/26


8/26


9/26

Source Sumber


10/26

Transportation


11/26

The Trap


12/26

Exploration


13/26


14/26


15/26

Mineralisasi

Types of Sulfide Mineralization

There are at least five types of sulfide mineralization present in the

Lavrion district.

1. Porphyry-style mineralization

2. Skarn-style mineralization are spatially associated with the Plaka

granodiorite

3. Breccia-style mineralization

4. Carbonate-replacement Pb-Zn-Ag mineralization5. Vein-style Pb-Zn-Ag mineralization is present at Adami


16/26

Photos of various types of mineralization and rock types in the Lavrion district. a. Multiple crosscutting quartzmolybdenite-

pyrite (Qtz-Mlb-Py) veins in the Plaka granodiorite (PG). b. Hornfels on the margin of the Plaka granodiorite porphyry. c.

Upper Marble (UM) and interbedded schists (S) near the southern margin of the Plaka granodiorite. Massive epidote (E)-bearing skarn is outlined. d. Massive carbonate-replacement ore along the contact of the Kaesariani schists and the Lower

Marble (LM), Jean Baptiste mine (Kamariza area). e. Massive sphalerite (Sph) and calcite (Cal) in carbonate-replacement

ore from Kamariza. f. Intergrown massive pyrite (Py) and sphalerite (Sph) with crosscutting calcite (Cal) veins in massive

ore from Plaka (Villia). g. Brecciated sphalerite-galena ore with clasts of Upper Marble in Vein 80 at the Adami mine. Note

the hornfels on the upper portion of the vein. h. Vein 80 from Adami mine showing bands of galena (Gn), siderite (Sd), and

calcite (Cal).


17/26

Jenis-jenis pengisian (open-space filling)


18/26

A. Crackle breccia with disseminated

sphalerite crystalsin white dolomite

cement, Robb Lake, BC.

B. Mosaic breccia with sphalerite crystalsin white dolomite cement, Robb Lake,

BC.

C. Rubble breccia consisting of variably

altered dolostone fragments and shale

fragments in white dolomite cement.

Note the dolostone fragments with

zebra texture, Robb Lake, BC.

D. Rock-matrix breccia with dolostone,

shale, and white sparry dolomite

fragments in dark grey fragmental

matrix, Robb Lake, BC.E. Aggregates of massive sphalerite

crystals and white sparry dolomite

along small fractures, Pine Point, NWT.

F. Aggregates of colloform sphaleriteand

skeletal galenacompletely replacing

the carbonate, Polaris, Nunavut; scalebar is 1 cm.


19/26

Various ore textures from

Polaris, Nunavut, NWT; scale

bar is 1 cm.

A. Keel ore: sphalerite andskeletal galena are

replacing the carbonate

clasts.

B. Keel ore: crystalline

sphalerite in solution

collapse breccia.C. Ocean zone: Massive

galenaand sparry

dolomite in

pseudobrecciated

carbonate host rock.


20/26


21/26

Peta deposit MVT di seluruh dunia


22/26

.

Distribution of Mississippi Valley-type deposits/districts plotted on a simplified geological map of Canada

(Map D1860A). Districts shown are,Cornwallis;Nanisivik, Pine Point, Prairie Creek, Robb Lake, Monarch-

Kicking Horse, Blende, Bear-Twit, Gayna River, Goz Creek, Gays River, Jubilee, Walton, Newfoundland Zn,Upton, and Esker


23/26

Pine Point


24/26


25/26

Summary of the characteristics of three Mississippi

Valley-type districts


26/26

Terima Kasih

Mississipi Valley Type Deposit

Documents

Transcript of Mississipi Valley Type Deposit