Title page for ETD etd-04072010-020130


Type of Document Master's Thesis
Author Jurinski, Joseph B.
URN etd-04072010-020130
Title Petrogenesis of the Moosehorn igneous complex, Maine
Degree Master of Science
Department Geology
Advisory Committee
Advisor Name Title
Sinha, A. Krishna Committee Chair
Ludman, Allan Committee Member
Tracy, Robert J. Committee Member
Keywords
  • Petrogenesis
Date of Defense 1990-05-15
Availability unrestricted
Abstract
New radiometric ages and field relations within the Coastal Maine Magmatic Province suggest a bimodal distribution of igneous rocks in both space and time. The earlier magmatic event is represented by the development of large igneous complexes which occur along a magmatic axis extending from Calais to Penobscot Bay, Maine. These complexes are dominated by mafic magmatism ranging in composition from olivine norite through quartz diorite and granodiorite. Partially crystallized mafic magmas are often intruded by slightly peraluminous biotite ± hornblende granites as demonstrated by the occurrence of a wide range of enclave-host relationships. The igneous complexes are commonly cut by younger voluminous biotite ± hornblende granites and represent the development of a new tectonothermal perturbation of the crust.

New radiometric data on igneous rocks from the Moosehorn Igneous Complex (MIC) near Calais, Maine indicate that the earlier magmatic event occurred during the interval of 440-420 m.y. This magmatic event in the MIC is marked by the emplacement of a large, complex assemblage of olivine norite, hypersthene gabbro, gabbro, biotite ± hornblende diorite, quartz diorite, and granodiorite. Compositional layering is present in many mafic bodies, and most commonly strikes northwest and dips gently to the southwest. The Moosehorn complex was intruded by the Baring granite before complete crystallization, resulting in the development of texturally diverse enclave swarms within the granite.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  LD5655.V855_1990.J875.pdf 31.70 Mb 02:26:44 01:15:28 01:06:02 00:33:01 00:02:49
  LD5655.V855_1990.J875_drw01.pdf 31.54 Mb 02:26:01 01:15:05 01:05:42 00:32:51 00:02:48
[BTD] next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.