Marble Bar Chert Member

These yellowy rocks are the volcanic rocks that underly the marble bar chert and the black is the chert.

Marble bar chert member.

Marble bar chert member is located at chinaman pool. You can see the nice layering all through here right up over. Here we report new evidence to suggest that haematite crystals in the jasper chert unit of the 3 46 gyr marble bar chert member mbc in the pilbara craton western australia probably nucleated. Here we interpret the finely laminated thin bedded cherts mixed conglomeratic beds.

We re right at the bottom. Most of the annual rainfall occurs in the summer. Marble bar has a hot desert climate köppen bwh with sweltering summers and warm winters. The town set a world record of most consecutive days of 100 f 37 8 c or above during a period of 160 days from 31 october 1923 to 7 april 1924.

This is the base of marble bar chert. It s a big thick chert. It is composed of two very distinctive sub units. Red and white banded chert at marble bar pool in the east pilbara.

Geological mapping reveals that the 3460 million year old marble bar chert was deposited in a caldera setting across an area of at least 50 km x 30 km. Sedimentological evidence indicates water depths exceeding 200 m. The lithofacies of the marble bar chert member on the outcrop are characterized by centimeter scale beds of red grey white and rare black layers. A paleomagnetic study of 261 discrete specimens collected from a 158 5 to 182 0 m section of the marble bar chert member revealed two distinct magnetic components lt.

Another specimen is marble bar chert of 3 5 ga warrawoona group member which is distributed at pilbara craton in western australia. The marble bar chert of the archean proterozoic sedimentary sequence is only slightly metamorphosed. The marble bar chert member dated between 3463 to 3454 ma thorpe et al 1992 is a world famous early archean unit with little metamorphism. The archean biosphere drilling project abdp drilled a continuous 270 m long oriented core from the towers formation which includes the marble bar chert member 3456 1 3476 0 ma in the pilbara craton northwestern australia.

The marble bar chert member represents brecciation of the chert cut by fault with the breccia material showing disruption of the original structure. 1 a well bedded evenly and finely flat laminated lower section characterized by a conspicuous red white dark blue banded facies and prominent brecciated beds locally referred to as. Gunflint chert specimens were collected from the locality of kakabeka falls near lake superior.