Fluid—rock interaction in the north-west Adirondack Mountains, New York State

1990 ◽  
pp. 180-197 ◽  
Author(s):  
Ian Cartwright ◽  
John W. Valley
Keyword(s):  
New York ◽  
New York State ◽  
Adirondack Mountains ◽  
Rock Interaction ◽  
York State ◽  
North West ◽  
The North

A study in the tornoceratidae: the succession of tornoceras and related genera in the North American devonian

1965 ◽  
Vol 250 (763) ◽  
pp. 79-130 ◽  
Keyword(s):  
New York ◽  
New Species ◽  
New York State ◽  
Lateral Lobe ◽  
Evolutionary Trends ◽  
York State ◽  
The North ◽  
New Subgenus ◽  
Lower Frasnian ◽  
Shed Light

The species of Tornoceras , Parodiceras , Epitornoceras and Aulatornoceras in North America are described. The study provides an independent stratigraphical goniatite zonation, particularly for the New York State Devonian, and it also provides an analysis of allomorphis in Tornoceras . A discussion on the protoconch apparatus and the significance of the metamorphosis at the nepionic constriction in Tornoceras is given. For the Tornoceras stock descriptions are provided where possible of the ontogeny from protoconch to adult of species at eleven successive stratigraphical levels, and faunas at other levels are also described. Thus the successional ontogenies shed light on the phylogeny of the stock. Faunas at each level may be morphologically defined, but few consistently maintained evolutionary trends have been observed. Shell form seems particularly subject to independent, and probably phenotypic variation. Through the equivalents of the Middle Devonian to the lower Frasnian, protoconch width appears to increase progressively. Similarly the suture becomes more undulating, particularly with regard to the steepness of the ventrad face of the lateral lobe. Later species show reversion to early characters in these respects. The origin of Tornoceras from Parodiceras is argued, and it is considered that Tornoceras gave rise to all later members of the Tornoceratidae. A new subgenus, Linguatornoceras , is erected for Frasnian and lower Famennian tornoceratids with small lingulate lateral lobes. Seven new species and subspecies are described.

scholarly journals Age and origin of the Cannon Point syenite, Essex County, New York: southernmost expression of Monteregian Hills magmatism?

2017 ◽  
Vol 54 (4) ◽  
pp. 379-392
Author(s):  
David G. Bailey ◽  
Marian Lupulescu ◽  
Jeffrey Chiarenzelli ◽  
Jonathan P. Traylor
Keyword(s):  
New York ◽  
New York State ◽  
Alkali Feldspar ◽  
Crustal Material ◽  
Lake Champlain ◽  
Essex County ◽  
York State ◽  
Fine Grained ◽  
The North ◽  
Basement Faults

Two syenite sills intrude the local Paleozoic strata of eastern New York State and are exposed along the western shore of Lake Champlain. The sills are fine-grained, alkali feldspar syenites and quartz syenites, with phenocrysts of sanidine and albite. The two sills are compositionally distinct, with crossing rare earth element profiles and different incompatible element ratios, which eliminates the possibility of a simple petrogenetic relationship. Zircon extracted from the upper sill yields a U–Pb age of 131.1 ± 1.7 Ma, making the sills the youngest known igneous rocks in New York State. This age is similar to that of the earliest intrusions in the Monteregian Hills of Quebec, >100 km to the north. Sr and Nd radiogenic isotope ratios are also similar to those observed in some of the syenitic rocks of the eastern Monteregian Hills. The Cannon Point syenites have compositions typical of A-type, within-plate granitoids. They exhibit unusually high Ta and Nb concentrations, resulting in distinct trace element signatures that are similar to those of the silicic rocks of the Valles Caldera, a large, rift-related magmatic system. We suggest that the Cannon Point syenites were melts derived primarily by anatexis of old, primitive, lower crustal material in response to Mesozoic rifting and to the intrusion of mantle-derived magmas. The sills indicate that the effects of continental rifting were spatially and temporally extensive, resulting in the reactivation of basement faults in the Lake Champlain Valley hundreds of kilometers west of the active rift boundary, and crustal melting >50 Ma after the initiation of rifting.

scholarly journals New insights on the evolution of the Lyon Mountain Granite and associated Kiruna-type magnetite-apatite deposits, Adirondack Mountains, New York State

Geosphere ◽  
2011 ◽  
Vol 7 (2) ◽  
pp. 357-389 ◽  
Author(s):  
Peter M. Valley ◽  
John M. Hanchar ◽  
Martin J. Whitehouse
Keyword(s):  
New York ◽  
New York State ◽  
Adirondack Mountains ◽  
York State

Some results of COCORP seismic reflection profiling in the Grenville-age Adirondack Mountains, New York State

1985 ◽  
Vol 22 (2) ◽  
pp. 141-153 ◽  
Author(s):  
S. L. Klemperer ◽  
L. D. Brown ◽  
J. E. Oliver ◽  
C. J. Ando ◽  
B. L. Czuchra ◽  
...  
Keyword(s):  
New York ◽  
Lower Crust ◽  
Seismic Reflection ◽  
New York State ◽  
Three Dimensional ◽  
Upper Crust ◽  
Adirondack Mountains ◽  
East Central ◽  
York State ◽  
Seismic Reflection Profiling

COCORP deep seismic reflection profiling in the Adirondack Mountains of northern New York State has revealed a prominent zone of layered reflectors in the lower crust of the east-central Adirondacks. The strong, layered reflectors (here termed the Tahawus complex) occur between 18 and 26 km depth, beneath the sparsely reflective, granulite-grade, surface terrane, which has been uplifted from depths greater than 20 km. The Tahawus complex apparently represents layered rocks of some type in the lower crust of the Adirondacks. Possibilities include gneissic layering, cumulate igneous layering, a layered sill complex, and underthrust sedimentary strata, The Tahawus complex may be spatially coincident with a previously detected, high-conductivity zone in the lower crust, suggesting that either unusual mineralogies or interstitial electrolytes are present in the Tahawus complex. In contrast to layered reflections discovered in the lower crust of the east-central Adirondacks and southeast of the Adirondacks, cross-cutting and discontinuous reflections are recorded from the upper crust on all the COCORP Adirondack lines, including lines in both the Adirondack Highlands and Lowlands. Available three-dimensional control suggests that reflections in the upper crust of the central Adirondacks are parallel to, and hence may be related to, the folded gneisses mapped at the surface. Shallow events are also observed on a COCORP profile close to the epicenter of the 7 October 1983 magnitude 5.2 earthquake in the central Adirondacks, but their relation to the earthquake is uncertain.

Introduction

2021 ◽  
pp. 1-9
Author(s):  
Laura Warren Hill
Keyword(s):  
New York ◽  
Political Economy ◽  
Civil Rights ◽  
Civil Rights Movement ◽  
Jim Crow ◽  
New York State ◽  
Political Mobilization ◽  
York State ◽  
The North ◽  
North And South

This chapter provides a background to the story of transformations brought by the rebellion of the Black community that happened first in Harlem, New York and then in Rochester on July 4, 1964. It points out that the rebellions in Rochester and Harlem shared a common spark: police brutality and misconduct. It also explains how the twin rebellions in New York State in 1964 were a foretaste of the Southern-based civil rights movement, which gave way to a different kind of Black political mobilization that centered largely in the urban North. The chapter reviews the consequences of the civil rights movement that dismantled Jim Crow as a system of legalized racism in the North and South. It emphasizes that the new Black political mobilization, which built on the energy arising from the rebellions and fashioning theories of a Black political economy, sought to address the structures of socioeconomic marginalization and impoverishment that survived the legal dismantling of Jim Crow.

Impacts of changing climate and atmospheric deposition on N and S drainage losses from a forested watershed of the Adirondack Mountains, New York State

2003 ◽  
Vol 9 (11) ◽  
pp. 1602-1619 ◽  
Author(s):  
Ji-Hyung Park ◽  
Myron J. Mitchell ◽  
Patrick J. McHale ◽  
Sheila F. Christopher ◽  
Tilden P. Meyers
Keyword(s):  
New York ◽  
Atmospheric Deposition ◽  
New York State ◽  
Forested Watershed ◽  
Adirondack Mountains ◽  
York State ◽  
Changing Climate
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