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Regional and Specific Deposits by Karl H. Wolf (Eds.)

By Karl H. Wolf (Eds.)

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5—1% of the rock. Ooids and quartz grains have been concen­ trated around burrows and within central portions of burrows. The burrows average 7—10 mm in diameter and are rimmed locally by hematite-goethite. Chamositic ooids have been highly compacted, except where enclosed by siderite, unlike little-deformed hematitic ooids in red ironstone. Both lower and upper dark ironstone are gradational to central red ironstone. Siderite and subordinate chamosite are the predominant ferriferous minerals in the upper as in the lower ironstone, but the rocks differ in most other respects.

48) concluded that, ". " Rates of B. H e m a t i t e - g o e t h i t e ooid partially replaced b y siderite. A hematitic core (dark) with t w o patches of siderite (white) is enveloped b y interlayered h e m a t i t e - g o e t h i t e , followed by purely hematitic layers preferentially replaced by siderite, and finally interlayered h e m a t i t e - g o e t h i t e . Interstices are filled with finely intergrown hematite, chamosite, siderite, and apatite. An apatite blade (white) occurs above the scale bar.

The two minerals normally occur finely intergrown and are jointly here termed "hematite-goethite". Detailed X-ray powder diffractometry has shown that hematite and goethite are nearly equally abundant in about half the red oolite and that hematite predominantes or is exclusively detected in the other half (Kimberley, 1974). Siderite is the only carbonate detected by diffractometry and occurs prominently in all the uppermost and lowermost dark ironstone and less prominently in central red ironstone.

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