Composition and distribution of silica in sediments of the Broken Ridge
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Within a dipping sequence of middle Cretaceous to Eocene sediments on Broken Ridge, opal-A, opal-CT, and quartz occur as minor constituents in carbonate and ash-rich sediments....
在破碎海岭（Broken Ridge）上的中白垩世至始新世倾斜沉积物层序中，蛋白石-A（opal-A）、蛋白石-CT（opal-CT）与石英作为次要组分赋存于富碳酸盐及富火山灰沉积物内……
