S, O, and Re-Os Isotope Studies of the Tamarack Igneous Complex: Melt-Rock Interaction During the Early Stage of Midcontinent Rift Development

2018 ◽  
Vol 113 (5) ◽  
pp. 1161-1179 ◽  
Author(s):  
V. Taranovic ◽  
E. M. Ripley ◽  
C. Li ◽  
S. B. Shirey
Keyword(s):  
Early Stage ◽  
Midcontinent Rift ◽  
Rock Interaction ◽  
Igneous Complex ◽  
Isotope Studies ◽  
Os Isotope

Re-Os isotope studies of Mindanao adakites: Implications for sources of metals and melts

Geology ◽  
2005 ◽  
Vol 33 (12) ◽  
pp. 957 ◽  
Author(s):  
Scott T. Dreher ◽  
Colin G. Macpherson ◽  
D. Graham Pearson ◽  
Jon P. Davidson
Keyword(s):  
Isotope Studies ◽  
Os Isotope

scholarly journals Tracing the evolution of calc-alkaline magmas: In-situ Sm–Nd isotope studies of accessory minerals in the Bergell Igneous Complex, Italy

2009 ◽  
Vol 260 (1-2) ◽  
pp. 73-86 ◽  
Author(s):  
Courtney J. Gregory ◽  
Christopher R.M. McFarlane ◽  
Jörg Hermann ◽  
Daniela Rubatto
Keyword(s):  
Calc Alkaline ◽  
Nd Isotope ◽  
Accessory Minerals ◽  
Igneous Complex ◽  
Isotope Studies ◽  
Alkaline Magmas

Further refinement to the timing of Mesoproterozoic magmatism, Lake Nipigon region, Ontario

2007 ◽  
Vol 44 (8) ◽  
pp. 1055-1086 ◽  
Author(s):  
L M Heaman ◽  
R M Easton ◽  
T R Hart ◽  
P Hollings ◽  
C A MacDonald ◽  
...  
Keyword(s):  
High Precision ◽  
Early Stage ◽  
Alkaline Magmatism ◽  
Main Stage ◽  
Flood Basalts ◽  
Midcontinent Rift ◽  
Mafic Intrusions ◽  
Rock Types ◽  
Dyke Swarms ◽  
Alkaline Complexes

The Midcontinent Rift in the Lake Superior region of North America is one of the best preserved examples of an aborted Precambrian intercontinental rift, one that hosts a diverse suite of rock types in addition to the well-studied and voluminous rift-fill flood basalts. Although there is a growing database of high-precision age information for the main volcanic packages and the largest mafic intrusions, there is relatively little information available on the absolute timing of mafic-ultramafic intrusions, dyke swarms, and alkaline complexes, especially in the Ontario portion of the rift. We report new high-precision U–Pb ages for 29 samples, primarily collected in the Lake Nipigon area, Ontario. From these new age results, it is now possible to expand the known distribution of Geon 15 magmatism in the region, confirm an early stage of Midcontinent Rift mafic magmatism between 1150 and 1130 Ma, provide evidence that significant mafic–ultramafic magmatism occurred in the Lake Nipigon region slightly earlier (~1115–1110 Ma) than the main stage of rift magmatism (1108–1094 Ma), and further document synchronous ~1110–1100 Ma tholeiitic and alkaline magmatism.

scholarly journals Chemical alteration of sediments on early stage of existing of hydrothermal systems in spreading zones of sedimented ridges (hydrothermal field “Dead Dog”, Middle Valley, Juan de Fuca Ridge)

2019 ◽  
Vol 98 ◽  
pp. 08011
Author(s):  
Alexandra Khakhina ◽  
Victor Kurnosov ◽  
Yurii Konovalov ◽  
Valeriya Churkina ◽  
Konstantin Galin
Keyword(s):  
Thermal Field ◽  
Chemical Elements ◽  
Early Stage ◽  
Hydrothermal Systems ◽  
Hydrothermal Fluids ◽  
Juan De Fuca Ridge ◽  
Hydrothermal Solutions ◽  
Rock Interaction ◽  
Fuca Ridge ◽  
Juan De Fuca

In sediments from Holes DSDP 858B, D, F, located near the active hot vent on the thermal field “Dead Dog” in the northern part of the Juan de Fuca Ridge, Middle Valley, a redistribution of chemical elements occurs as a result of solution-rock interaction. During this process, the increase/decrease of their content in hydrothermally altered sediments inversely reflects the decrease/increase of their content in the solution. Nonregular distribution of microelements and REE’s in hydrothermally altered sediments, like a layer pie, reflects the participation of both ascending hydrothermal fluids and lateral flows of hydrothermal solutions in alteration of chemical composition of sediments.

Alterations in the number of motoneurons containing immunoreactive calcitonin gene-related peptide(CGRP)& choline acetyltransferase(ChAT) in the cervical spinal cord of the wobbler mouse during the development of the motoneuron disease

1995 ◽  
Vol 53 ◽  
pp. 970-971
Author(s):  
L. Vacca-Galloway ◽  
Y.Q. Zhang ◽  
P. Bose ◽  
S.H. Zhang
Keyword(s):  
Spinal Cord ◽  
Early Stage ◽  
Cervical Spinal Cord ◽  
Wild Type Mouse ◽  
Reflex Response ◽  
Mouse Strains ◽  
Behavioral Tests ◽  
Wobbler Mouse ◽  
Stage 4 ◽  
Stage 1

The Wobbler mouse (wr) has been studied as a model for inherited human motoneuron diseases (MNDs). Using behavioral tests for forelimb power, walking, climbing, and the “clasp-like reflex” response, the progress of the MND can be categorized into early (Stage 1, age 21 days) and late (Stage 4, age 3 months) stages. Age-and sex-matched normal phenotype littermates (NFR/wr) were used as controls (Stage 0), as well as mice from two related wild-type mouse strains: NFR/N and a C57BI/6N. Using behavioral tests, we also detected pre-symptomatic Wobblers at postnatal ages 7 and 14 days. The mice were anesthetized and perfusion-fixed for immunocytochemical (ICC) of CGRP and ChAT in the spinal cord (C3 to C5).Using computerized morphomety (Vidas, Zeiss), the numbers of IR-CGRP labelled motoneurons were significantly lower in 14 day old Wobbler specimens compared with the controls (Fig. 1). The same trend was observed at 21 days (Stage 1) and 3 months (Stage 4). The IR-CGRP-containing motoneurons in the Wobbler specimens declined progressively with age.

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