Bimodal Silurian and lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine: interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern Maine
Gespeichert in:
| Beteiligte Personen: | , |
|---|---|
| Format: | Buch |
| Sprache: | Englisch |
| Veröffentlicht: |
Washington, DC
U.S. Government Print. Office
1981
|
| Schriftenreihe: | Geological Survey professional paper
1184 |
| Links: | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=027392194&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| Beschreibung: | Literaturverz. S. 25 - 28 |
| Umfang: | IV, 32 S. graph. Darst., Kt. |
Internformat
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| 245 | 1 | 0 | |a Bimodal Silurian and lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine |b interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern Maine |c by Olcott Gates and Robert H. Moench |
| 264 | 1 | |a Washington, DC |b U.S. Government Print. Office |c 1981 | |
| 300 | |a IV, 32 S. |b graph. Darst., Kt. | ||
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| 490 | 1 | |a Geological Survey professional paper |v 1184 | |
| 500 | |a Literaturverz. S. 25 - 28 | ||
| 700 | 1 | |a Moench, Robert H. |e Verfasser |4 aut | |
| 810 | 2 | |a United States Geological Survey |t US Geological Survey professional paper |v 1184 |w (DE-604)BV000005472 |9 1184 | |
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Datensatz im Suchindex
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| adam_text | Bimodal Silurian and Lower Devonian
Volcanic Rock Assemblages in the
Machias-Eastport Area, Maine
By OLCOTT GATES and ROBERT H MOENCH /7o c /foyii/An • *! / V
t
GEOLOGICALSURVEYPROFESSIONALPAPER1184
Interpretation of chemical data for samples of
weakly metamorphosed volcanic rocks of the
coastal volcanic belt in southeastern Maine
UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON 1981
CONTENTS
Page
Abstract 1
Introduction 1
Acknowledgments 2
Regional paleogeographic and tectonic relationships 2
Stratigraphy and structure of the Machias-Eastport area 4
Definition and petrography of volcanic assemblages 8
Silurian assemblage 9
Older Devonian assemblage 10
Younger Devonian assemblage 10
Sampling 11
Alteration 11
V olcanic petrology 13
Silurian assemblage 20
Older Devonian assemblage 21
Younger Devonian assemblage 22
Summary and origin 22
Tectonic implications 23
References cited 25
Appendix A 30
Appendix B 31
ILLUSTRATIONS
Page
FIGURE 1 Map of New England and Maritime Provinces showing Silurian and
Lower Devonian volcanic tracts and principal paleotectonic features 3
2 Simplified map of the bedrock geology of the Machias-Eastport portion of
the coastal volcanic belt 5
3 Schematic cross section southeast from Oak Bay to the Bay of Fundy,
showing relations of Silurian and Devonian formations to one another and
to contemporaneous normal faults 6
4 Harker diagram showing major oxides, recalculated without H20 and C02 14
5 Alkali-silica variation diagram 15
6 AFM diagram 16
7 Variation of SiO,, Ti02, and FeO* relative to solidification index 1?
8 Major-oxide and minor-element data for least altered basalts of the Machias-
Eastport area compared with data of McDougall for the Columbia River
Basalt Group 18
TABLES
•
Page
TABLE 1 Volume of volcanic and hypabyssal intrusive rock types in the Eastport quad
rangle, estimated from areas of each type in cross sections 8
2 Major-oxide analyses of volcanic rocks of the Machias-Eastport area, Maine 12
3 Selected and average minor-element data on volcanic rocks 19
4 Silurian basalts from the Machias-Eastport area compared with high-alumina
tholeiites and calc alkaline basalts from other regions 20
ill
|
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| spellingShingle | Gates, Olcott Moench, Robert H. Bimodal Silurian and lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern Maine |
| title | Bimodal Silurian and lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern Maine |
| title_auth | Bimodal Silurian and lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern Maine |
| title_exact_search | Bimodal Silurian and lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern Maine |
| title_full | Bimodal Silurian and lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern Maine by Olcott Gates and Robert H. Moench |
| title_fullStr | Bimodal Silurian and lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern Maine by Olcott Gates and Robert H. Moench |
| title_full_unstemmed | Bimodal Silurian and lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern Maine by Olcott Gates and Robert H. Moench |
| title_short | Bimodal Silurian and lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine |
| title_sort | bimodal silurian and lower devonian volcanic rock assemblages in the machias eastport area maine interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern maine |
| title_sub | interpretation of chemical data for samples of weakly metamorphosed volcanic rocks of the coastal volcanic belt in southeastern Maine |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=027392194&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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