York Haven Diabase: Difference between revisions
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== Formation == |
== Formation == |
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The York Haven Diabase began as one of many trough-like basins, which stretched from what is today northern New Jersey towards the northernmost tip of Virginia. These basins opened during the Mesozoic Era along the eastern continental margin of North America and created areas for sediments and lava flows to settle.<ref |
The York Haven Diabase began as one of many trough-like basins, which stretched from what is today northern New Jersey towards the northernmost tip of Virginia. These basins opened during the Mesozoic Era along the eastern continental margin of North America and created areas for sediments and lava flows to settle.<ref>{{Cite journal|last=Mangan|first=Margaret T.|last2=Marsh|first2=Bruce D.|last3=Froelich|first3=Albert J.|last4=Gottfried|first4=David|date=1993-12-01|title=Emplacement and Differentiation of the York Haven Diabase Sheet, Pennsylvania|url=https://academic.oup.com/petrology/article/34/6/1271/1395943|journal=Journal of Petrology|language=en|volume=34|issue=6|pages=1271–1302|doi=10.1093/petrology/34.6.1271|issn=0022-3530}}</ref> These are inundated with intrusions, with all of them being primarily tholeiitic. The York Haven Diabase is considered to have a high titanium oxide (TiO<small>2</small>) content and darker color, which differentiates it from the overlying Rossville Diabase which is considered to have a low titanium oxide content.<ref name=":0" /><ref>{{Cite journal|last=Smith|first=Robert C.|last2=Rose|first2=Arthur W.|last3=Lanning|first3=Robert M.|date=1975-07-01|title=Geology and Geochemistry of Triassic Diabase in Pennsylvania|url=https://pubs.geoscienceworld.org/gsa/gsabulletin/article/86/7/943/188996/Geology-and-Geochemistry-of-Triassic-Diabase-in|journal=GSA Bulletin|language=en|volume=86|issue=7|pages=943–955|doi=10.1130/0016-7606(1975)862.0.CO;2|issn=0016-7606}}</ref> |
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[[File:YorkHavenDiabase1.jpg|thumb|461x461px|The York Haven Diabase is within the Gettysburg Basin]] |
[[File:YorkHavenDiabase1.jpg|thumb|461x461px|The York Haven Diabase is within the Gettysburg Basin]] |
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The York Haven Diabase was previously thought to be Triassic in age, however a map published in 1980 by the Pennsylvania Geologic Survey provided evidence for the diabase to be Jurassic in age.<ref>{{Cite journal|last=1Berg 2Edmunds 3Geyer|first=1T.M. 2W.E. 3A.R.|date=15 March 2021|title=Geologic map of Pennsylvania: Pennsylvania Geological Survey|journal=Pennsylvania Geologic Survey|volume=2nd Edition|pages=Map 1}}</ref> |
The York Haven Diabase was previously thought to be Triassic in age, however a map published in 1980 by the Pennsylvania Geologic Survey provided evidence for the diabase to be Jurassic in age.<ref>{{Cite journal|last=1Berg 2Edmunds 3Geyer|first=1T.M. 2W.E. 3A.R.|date=15 March 2021|title=Geologic map of Pennsylvania: Pennsylvania Geological Survey|journal=Pennsylvania Geologic Survey|volume=2nd Edition|pages=Map 1}}</ref> |
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Revision as of 18:07, 16 March 2021
The York Haven Diabase is a rock formation in Pennsylvania, United States. It underlies the Rossville Diabase and is aged to the Jurassic.[1] The formation is volcanic to subvolcanic, meaning it formed on or near the earth's surface, with a mafic composition and is categorized as a basalt.[1] The York Haven Diabase is a member of the larger Gettysburg Basin.[2]
Formation
The York Haven Diabase began as one of many trough-like basins, which stretched from what is today northern New Jersey towards the northernmost tip of Virginia. These basins opened during the Mesozoic Era along the eastern continental margin of North America and created areas for sediments and lava flows to settle.[3] These are inundated with intrusions, with all of them being primarily tholeiitic. The York Haven Diabase is considered to have a high titanium oxide (TiO2) content and darker color, which differentiates it from the overlying Rossville Diabase which is considered to have a low titanium oxide content.[1][4]
The York Haven Diabase was previously thought to be Triassic in age, however a map published in 1980 by the Pennsylvania Geologic Survey provided evidence for the diabase to be Jurassic in age.[5]
Range
The York Haven Diabase, named after York County, Pennsylvania, can be found across many counties.[6] These counties include Adams, Berks, Buck, Chester, Cumberland, Dauphin, Lancaster, Lebanon, Lehigh, Montgomery, and as previously stated, York.[1]
References
- ^ a b c d "Diabase". USGS. Retrieved 15 March 2021.
{{cite web}}: CS1 maint: url-status (link) - ^ 1Mangan 2Marsh 3Froelich 4Gottfried, 1Margaret 2Bruce 3Albert 4David (15 March 2021). "Emplacement and Differentiation of the York Haven Diabase Sheet, Pennsylvania". Journal of Petrology. 34: 1271–1302 – via Oxford Academic.
{{cite journal}}: CS1 maint: numeric names: authors list (link) - ^ Mangan, Margaret T.; Marsh, Bruce D.; Froelich, Albert J.; Gottfried, David (1993-12-01). "Emplacement and Differentiation of the York Haven Diabase Sheet, Pennsylvania". Journal of Petrology. 34 (6): 1271–1302. doi:10.1093/petrology/34.6.1271. ISSN 0022-3530.
- ^ Smith, Robert C.; Rose, Arthur W.; Lanning, Robert M. (1975-07-01). "Geology and Geochemistry of Triassic Diabase in Pennsylvania". GSA Bulletin. 86 (7): 943–955. doi:10.1130/0016-7606(1975)862.0.CO;2. ISSN 0016-7606.
- ^ 1Berg 2Edmunds 3Geyer, 1T.M. 2W.E. 3A.R. (15 March 2021). "Geologic map of Pennsylvania: Pennsylvania Geological Survey". Pennsylvania Geologic Survey. 2nd Edition: Map 1.
{{cite journal}}: CS1 maint: numeric names: authors list (link) - ^ Jones, Jeri. "York County has more igneous rocks than from lava". York Daily Record. Retrieved 2021-03-15.