Magmatic occurrences in the Central Arava (southern Israel) based on Geology and Magnetometry

Ginat Hanan; Rybakov Michael; Shirman Boris; Lazar Michael

doi:10.1016/j.jseaes.2014.01.005

Magmatic occurrences in the Central Arava (southern Israel) based on Geology and Magnetometry

Ginat Hanan, Rybakov Michael, Shirman Boris, Lazar Michael

Department of Marine Geosciences

Research output: Contribution to journal › Article › peer-review

Abstract

The Eshet Ridge is located in the Central Arava near Wadi Paran. Geological data were collected using ground magnetic surveys and petrophysical measurements (magnetic susceptibility and density). The goal was to reveal the structure and nature of a concealed magmatic body under the ridge. Integrated gravity and magnetic interpretation together with seismic reflection data (including 23/4 modeling) indicated the presence of a deep-seated basic magmatic intrusion. Occurrence of Fe-mineralized rocks along the ridge supports subsurface data. The magmatic body was intruded in the hard Turonian rocks of the Eshet Ridge. Basic magmatic exposures dating from the Early Miocene were evident along Wadi Ashosh (in the eastern Negev) and its margins 18km. to the north of the ridge. A new outcrop of basic magmatic intrusion was found southwest of the Tzukim settlement. Magnetic measurements indicated a similarity between their magnetic pattern and the Ashosh basic magmatics, which were dated to 20.4±0.7Ma. Volcanoclastic tuff pebbles (magnetic susceptibility of around 2-7*10^-3SI) surrounded by conglomerate were discovered at two sites in Wadi Demma and Wadi Menuha (streams that drain near the Eshet Ridge and 2km south of it, respectively). The conglomerates contained mostly limestone, chalk and chert fragments; not more than 5% of which were volcanic pebbles. Two pebbles were dated to 24.4±0.7and 21.5±0.5Ma. The magmatic outcrops in Wadi Ashosh, the magmatic dyke near Tzukim and the volcanic purple and black pebbles near Wadi Menuha were all dated to the very Late Oligocene-Early Miocene. The magmatic body identified in this study under the Eshet Ridge was termed the Eshet Intrusion and is connected to, and even the source of, all these phenomena.

Original language	English
Pages (from-to)	106-116
Number of pages	11
Journal	Journal of Asian Earth Sciences
Volume	85
DOIs	https://doi.org/10.1016/j.jseaes.2014.01.005
State	Published - May 2014

Bibliographical note

Funding Information:
We would like to thank the Survey of Israel for valuable support with magnetic measurements as well as Mr. Gideon Ragolski from Paran who took us to the previously unreported outcrop near Tzukim. A grant from the Earth Science Research Administration of Israel’s Ministry of National Infrastructures provided the main funding for this project. We would also like to thank Dr. Gidi Shteinietz and Dr. Judith Har Lavan from the Geological Survey of Israel for the K–Ar dating of the pebbles from Wadi Menuha; Dr. Yaron Katzir from Ben Gurion University for his helpful comments on this paper; V. Trifonov, A. Segev and an anonymous reviewer for their valuable comments and suggestions.

Keywords

Arava
Integrated geophysics
Late Oligocene and Miocene volcanism in Israel
Shallow magmatics

ASJC Scopus subject areas

Geology
Earth-Surface Processes

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10.1016/j.jseaes.2014.01.005

Cite this

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title = "Magmatic occurrences in the Central Arava (southern Israel) based on Geology and Magnetometry",

abstract = "The Eshet Ridge is located in the Central Arava near Wadi Paran. Geological data were collected using ground magnetic surveys and petrophysical measurements (magnetic susceptibility and density). The goal was to reveal the structure and nature of a concealed magmatic body under the ridge. Integrated gravity and magnetic interpretation together with seismic reflection data (including 23/4 modeling) indicated the presence of a deep-seated basic magmatic intrusion. Occurrence of Fe-mineralized rocks along the ridge supports subsurface data. The magmatic body was intruded in the hard Turonian rocks of the Eshet Ridge. Basic magmatic exposures dating from the Early Miocene were evident along Wadi Ashosh (in the eastern Negev) and its margins 18km. to the north of the ridge. A new outcrop of basic magmatic intrusion was found southwest of the Tzukim settlement. Magnetic measurements indicated a similarity between their magnetic pattern and the Ashosh basic magmatics, which were dated to 20.4±0.7Ma. Volcanoclastic tuff pebbles (magnetic susceptibility of around 2-7*10-3SI) surrounded by conglomerate were discovered at two sites in Wadi Demma and Wadi Menuha (streams that drain near the Eshet Ridge and 2km south of it, respectively). The conglomerates contained mostly limestone, chalk and chert fragments; not more than 5% of which were volcanic pebbles. Two pebbles were dated to 24.4±0.7and 21.5±0.5Ma. The magmatic outcrops in Wadi Ashosh, the magmatic dyke near Tzukim and the volcanic purple and black pebbles near Wadi Menuha were all dated to the very Late Oligocene-Early Miocene. The magmatic body identified in this study under the Eshet Ridge was termed the Eshet Intrusion and is connected to, and even the source of, all these phenomena.",

keywords = "Arava, Integrated geophysics, Late Oligocene and Miocene volcanism in Israel, Shallow magmatics",

author = "Ginat Hanan and Rybakov Michael and Shirman Boris and Lazar Michael",

note = "Funding Information: We would like to thank the Survey of Israel for valuable support with magnetic measurements as well as Mr. Gideon Ragolski from Paran who took us to the previously unreported outcrop near Tzukim. A grant from the Earth Science Research Administration of Israel{\textquoteright}s Ministry of National Infrastructures provided the main funding for this project. We would also like to thank Dr. Gidi Shteinietz and Dr. Judith Har Lavan from the Geological Survey of Israel for the K–Ar dating of the pebbles from Wadi Menuha; Dr. Yaron Katzir from Ben Gurion University for his helpful comments on this paper; V. Trifonov, A. Segev and an anonymous reviewer for their valuable comments and suggestions. ",

year = "2014",

month = may,

doi = "10.1016/j.jseaes.2014.01.005",

language = "English",

volume = "85",

pages = "106--116",

journal = "Journal of Asian Earth Sciences",

issn = "1367-9120",

publisher = "Elsevier",

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AU - Hanan, Ginat

AU - Michael, Rybakov

AU - Boris, Shirman

AU - Michael, Lazar

N1 - Funding Information: We would like to thank the Survey of Israel for valuable support with magnetic measurements as well as Mr. Gideon Ragolski from Paran who took us to the previously unreported outcrop near Tzukim. A grant from the Earth Science Research Administration of Israel’s Ministry of National Infrastructures provided the main funding for this project. We would also like to thank Dr. Gidi Shteinietz and Dr. Judith Har Lavan from the Geological Survey of Israel for the K–Ar dating of the pebbles from Wadi Menuha; Dr. Yaron Katzir from Ben Gurion University for his helpful comments on this paper; V. Trifonov, A. Segev and an anonymous reviewer for their valuable comments and suggestions.

PY - 2014/5

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N2 - The Eshet Ridge is located in the Central Arava near Wadi Paran. Geological data were collected using ground magnetic surveys and petrophysical measurements (magnetic susceptibility and density). The goal was to reveal the structure and nature of a concealed magmatic body under the ridge. Integrated gravity and magnetic interpretation together with seismic reflection data (including 23/4 modeling) indicated the presence of a deep-seated basic magmatic intrusion. Occurrence of Fe-mineralized rocks along the ridge supports subsurface data. The magmatic body was intruded in the hard Turonian rocks of the Eshet Ridge. Basic magmatic exposures dating from the Early Miocene were evident along Wadi Ashosh (in the eastern Negev) and its margins 18km. to the north of the ridge. A new outcrop of basic magmatic intrusion was found southwest of the Tzukim settlement. Magnetic measurements indicated a similarity between their magnetic pattern and the Ashosh basic magmatics, which were dated to 20.4±0.7Ma. Volcanoclastic tuff pebbles (magnetic susceptibility of around 2-7*10-3SI) surrounded by conglomerate were discovered at two sites in Wadi Demma and Wadi Menuha (streams that drain near the Eshet Ridge and 2km south of it, respectively). The conglomerates contained mostly limestone, chalk and chert fragments; not more than 5% of which were volcanic pebbles. Two pebbles were dated to 24.4±0.7and 21.5±0.5Ma. The magmatic outcrops in Wadi Ashosh, the magmatic dyke near Tzukim and the volcanic purple and black pebbles near Wadi Menuha were all dated to the very Late Oligocene-Early Miocene. The magmatic body identified in this study under the Eshet Ridge was termed the Eshet Intrusion and is connected to, and even the source of, all these phenomena.

AB - The Eshet Ridge is located in the Central Arava near Wadi Paran. Geological data were collected using ground magnetic surveys and petrophysical measurements (magnetic susceptibility and density). The goal was to reveal the structure and nature of a concealed magmatic body under the ridge. Integrated gravity and magnetic interpretation together with seismic reflection data (including 23/4 modeling) indicated the presence of a deep-seated basic magmatic intrusion. Occurrence of Fe-mineralized rocks along the ridge supports subsurface data. The magmatic body was intruded in the hard Turonian rocks of the Eshet Ridge. Basic magmatic exposures dating from the Early Miocene were evident along Wadi Ashosh (in the eastern Negev) and its margins 18km. to the north of the ridge. A new outcrop of basic magmatic intrusion was found southwest of the Tzukim settlement. Magnetic measurements indicated a similarity between their magnetic pattern and the Ashosh basic magmatics, which were dated to 20.4±0.7Ma. Volcanoclastic tuff pebbles (magnetic susceptibility of around 2-7*10-3SI) surrounded by conglomerate were discovered at two sites in Wadi Demma and Wadi Menuha (streams that drain near the Eshet Ridge and 2km south of it, respectively). The conglomerates contained mostly limestone, chalk and chert fragments; not more than 5% of which were volcanic pebbles. Two pebbles were dated to 24.4±0.7and 21.5±0.5Ma. The magmatic outcrops in Wadi Ashosh, the magmatic dyke near Tzukim and the volcanic purple and black pebbles near Wadi Menuha were all dated to the very Late Oligocene-Early Miocene. The magmatic body identified in this study under the Eshet Ridge was termed the Eshet Intrusion and is connected to, and even the source of, all these phenomena.

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KW - Integrated geophysics

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KW - Shallow magmatics

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SN - 1367-9120

VL - 85

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JO - Journal of Asian Earth Sciences

JF - Journal of Asian Earth Sciences

ER -

Magmatic occurrences in the Central Arava (southern Israel) based on Geology and Magnetometry

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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