Evidence for shallow-marine origin of a ‘Monterey-formation type’ chert-phosphorite-dolomite seqence: Amman formation (Late cretaceous), Central Jordan

Abed, Abdulkader M.; Kraishan, Ghazi

doi:10.1007/bf02536839

Cited by 25 publications

(17 citation statements)

References 13 publications

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“…The association of microcrystalline silica, chalcedony, quartzine, and coarser crystalline quartz is commonly observed in chert‐replaced carbonates and evaporites (e.g., Laschet 1984; Hesse 1989; Heaney 1993) and reflects the pre‐impact diagenetic (recrystallized) composition of the chert nodule. The cherts of the Amman Silicified Limestone formation are thought to represent biogenic limestones originally deposited within a shallow‐marine inner epicontinental shelf and replaced by silica during early diagenesis (Abed and Kraishan 1991). Subsequent to silica precipitation and diagenesis, the chert nodule experienced a multistage evolution according to the regional and local geologic conditions through the Late Mesozoic and Cenozoic (e.g., Bender 1968; Baaske 2004).…”

Section: Discussion and Summarymentioning

confidence: 99%

Shock‐metamorphic microfeatures in chert from the Jebel Waqf as Suwwan impact structure, Jordan

Schmieder

Reimold

Buchner

et al. 2011

Meteorit & Planetary Scien

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Abstract-The petrographic investigation of a shocked, chalcedony-, quartzine-, and quartzbearing allochthonous chert nodule (probably Upper Cretaceous) recovered from surficial wadi gravels in the inner parts of the central uplift of the approximately 6 km in diameter Jebel Waqf as Suwwan impact structure, Jordan, reveals new potential shock indicators in microfibrous-spherulitic silica, in addition to well-established shock-metamorphic effects in coarser crystalline quartz. The microcrystalline chert groundmass exhibits a macroscopic dendritic and suborthogonal fracture pattern commonly associated with thin ''recrystallization bands'' that intersect the pre-existing diagenetic chert fabric. Fibrous aggregates of quartzine spherulites in chalcedony-quartzine-quartz veinlets locally have a shattered appearance and show conspicuous ''curved fractures'' perpendicular to the quartzine fiber direction (and parallel to [0001]) that commonly trend subparallel to planar fractures (PFs) in neighboring shocked quartz. Quartz exhibits PFs, feather features (FFs), and mainly single sets of planar deformation features (PDFs) parallel to the basal plane (0001) (Brazil twins) and, rarely, additional PDFs parallel to {101 3}. Shock petrography indicates shock pressures of ‡10 GPa and high shock-induced differential stresses that affected the chert nodule. The internal crosscutting relationships of primary diagenetic and impact-related deformational features together with shockpressure estimates suggest that the curved fractures across quartzine spherulites might represent specific (low-to mediumpressure) shock-metamorphic features, possibly in structural analogy to basal plane PFs in quartz. The dendritic-suborthogonal fractures in the microcrystalline chert groundmass and recrystallization bands are likely related to impact-induced shear deformation and recrystallization, respectively, and cannot be considered as definite shock indicators.

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Section: Discussion and Summarymentioning

confidence: 99%

Shock‐metamorphic microfeatures in chert from the Jebel Waqf as Suwwan impact structure, Jordan

Schmieder

Reimold

Buchner

et al. 2011

Meteorit & Planetary Scien

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“…This phosphatic kerogen is, therefore, better classified as Type 11-S. Pyrite scarcity in this type of kerogen suggests that any bacterially produced sulphur reacted with the associated organic matter, yielding high-sulphur kerogen and bitumen. The absence of pyrite is a feature of the phosphorite in Jordan (Abed and Al-Agha, 1989;Abed and Kraishan, 1991).…”

Section: Elemental Analysis Of Kerogenmentioning

confidence: 98%

“…Examples include certain Wyoming oils believed to have been sourced from the Permian Phosphoria Formation (Barbat, 1967). Most relevant is the Miocene Monterey Formation in California (Baskin and Peters, 1992 amongst many others) which shows great similarities with the Amman and Mishash Formations in Jordan and the Negev, respectively (Abed and Kraishan, 1991;Kolodny and Garrison, 1994).…”

Section: Introductionmentioning

confidence: 96%

Source rock potential of the phosphorite–bituminous chalk–marl sequence in Jordan

Abed

Arouri

Boreham

2005

Marine and Petroleum Geology

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“…The Campanian Amman Formation is an excellent shallow aquifer in Jordan. It consists of bedded chert alternating with limestone, overlain by phosphorites, limestone, and minor chert facies (Bender 1974;Abed and Kraishan 1991;Powell and Moh'd 2011). The Amman Formation (B2) is hydraulically connected with the Wadi Es Sir Formation (A7), forming a major shallow aquifer in Jordan, known as the B2-A7 aquifer.…”

Section: Geological and Hydrogeological Settingmentioning

confidence: 99%

Hydrogeochemistry of groundwater from karstic limestone aquifer highlighting arsenic contamination: case study from Jordan

et al. 2015

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Groundwater wells in the Amman-Wadi Es Sir Aquifer (B2/A7) throughout Jordan are investigated for their arsenic (As) and element-by-element geochemical behavior. Groundwater wells are found to have total arsenic concentrations above the recommended levels designated by the Jordanian drinking water standard, the Environmental Protection Agency of the United States, and the World Health Organization. Arsenic distribution in the aquifer is variable, but it is detected with a concentration of ≥10 ppb in 87 samples out of the analyzed 150 groundwater samples, with a maximum concentration of 173 ppb. Elevated As concentrations can be attributed to several mechanisms. One of these mechanisms is accounted for to the interaction between groundwater and the natural phosphorite deposits in the upper part of the aquifer and oil shale deposits overlying it. The high significant correlation between arsenic, phosphorus, and calcium concentrations in the analyzed groundwater samples suggest that these elements are derived from the same source.Moreover, scanning electron microscopy shows the association of As with the P and Ca in the phosphorite; pyrite is present in the oil shale samples, which were collected from the Muwaqqar formation overlying the aquifer. EDAX analysis shows that substantial As concentrations are present in phosphate and pyrite. This study suggests that the major mechanism responsible for releasing As from the aquifer material into the groundwater is a simple dissolution reaction. However, Piper and Durov diagrams, correlation coefficients, and factor analysis all suggest that water interaction with phosphate and oil shale deposits, sorption of heavy metals, and simple dissolution of iron oxyhydroxides are together the primary factors affecting the chemistry of the groundwater and responsible for the elevated As values in some wells.

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Evidence for shallow-marine origin of a ‘Monterey-formation type’ chert-phosphorite-dolomite seqence: Amman formation (Late cretaceous), Central Jordan

Cited by 25 publications

References 13 publications

Shock‐metamorphic microfeatures in chert from the Jebel Waqf as Suwwan impact structure, Jordan

Shock‐metamorphic microfeatures in chert from the Jebel Waqf as Suwwan impact structure, Jordan

Source rock potential of the phosphorite–bituminous chalk–marl sequence in Jordan

Hydrogeochemistry of groundwater from karstic limestone aquifer highlighting arsenic contamination: case study from Jordan

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