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Synopsis
Excerpt from Petrography of the Newark Igneous Rocks of New Jersey
Small inclusions are found in the base of First Mountain, and probably also in the others, consisting of sandstone or shale frag ments up to 2 or 3 inches in diameter, which are baked into a hard jaspery condition. An oval sandstone mass, 2 by 4; feet, appar ently unaltered, was found in the Third Mountain sheet at Pomp ton. The only microscopic changes noticeable in the smaller inclu sions are a darkening of the red color and the development of crystalline calcite, both chiefly within 2 or 3 millimeters of the contact. Contact effects on the underlying strata are of a similar character where found at all. Often no change whatever is ap parent.
The shale 1 to feet beneath the First Mountain basalt, around the curved southwestern portion, is mottled by partial bleaching and rendered porous by the removal of small calcite crystals which this rock usually contains. In the spaces native copper and chalcocite have been deposited. Nothing comparable to this is found under the. Other sheets, nor under other portions of this one. The effects are attributed to ore-bearing solutions, proba bly magmatic waters, that brought up the copper from the intrusive sheet of Palisade diabase below.
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Petrography of the Newark Igneous Rocks of New Jersey (Classic Reprint)
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Paperback. Condition: New. Print on Demand. This book delves into the petrography, or detailed study of the mineral composition, of the Newark Igneous Rocks of New Jersey. The author examines two types of the rockâ"intrusive diabase sheets and extrusive basalt flowsâ"which formed during the Triassic period some 200 million years ago. Using thin sections to analyze the rocks' microscopic structures, the author describes the mineralogical variations between the two rock types. The diabase sheets, which were injected between layers of sediment, are typically coarse-grained and contain quartz and orthoclase minerals. The basalt flows, on the other hand, are fine-grained and lack these minerals. The author also discusses the process of differentiation, in which gravity causes heavier minerals to settle out of the molten rock, leading to the formation of different rock types. This book provides a comprehensive analysis of the Newark Igneous Rocks, contributing to our understanding of their formation and composition. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Seller Inventory # 9781332900138_0
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Petrography of the Newark Igneous Rocks of New Jersey Classic Reprint
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PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000. Seller Inventory # LW-9781332900138
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Petrography of the Newark Igneous Rocks of New Jersey Classic Reprint
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PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000. Seller Inventory # LW-9781332900138
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