The Vizcaíno terrane: another occurrence of Upper Triassic shallow-marine carbonates in Mexico

Naseem

Acta Geologica Sinica (Eng)

et al. 2022

The present study deals with the depositional facies, diagenetic processes and sequence stratigraphy of the shallow marine carbonates of the Samana Suk Formation, Kohat Basin, in order to elucidate its reservoir quality. The Samana Suk Formation consists of thin to thick-bedded, oolitic, bioclastic, dolomitic and fractured limestone. Based on the integration of outcrop, petrographic and biofacies analyses, the unit is thought to have been deposited on a gentle homoclinal ramp in peritidal, lagoonal and carbonate shoal settings. Frequent variations in microfacies based sea-level curve have revealed seven Transgressive Systems Tracts (TSTs) and six Regressive Systems Tracts (RSTs). The unit has undergone various stages of diagenetic processes, including mechanical and chemical compaction, cementation, micritization, dissolution and dolomitization. The petrographic analyses show the evolution of porosity in various depositional and diagenetic phases. The fenestral porosity was mainly developed in peritidal carbonates during deposition, while the burial dissolution and diagenetic dolomitization have greatly enhanced the reservoir potential of the rock unit, as is further confirmed by the plug porosity and permeability analyses. The porosities and permeabilities were higher in shoal facies deposited in TSTs, as compared to lagoonal and peritidal facies, except for the dolomite in mudstone, deposited during RSTs. Hence good, moderate and poor reservoir potential is suggested for shoal, lagoonal and peritidal facies, respectively.

Section: Carbonate Shoal Facies Associationmentioning

confidence: 94%

Facies Analysis, Sequence Stratigraphy and Diagenetic Studies of the Jurassic Carbonates of the Kohat Basin, Northwest Pakistan: Reservoir Implications

Naseem

Acta Geologica Sinica (Eng)

et al. 2022

“…As documented by multiple studies conducted over the past 15 years, the Triassic Panthalassa met all the environmental conditions for the development of numerous shallow‐water carbonate systems (Chablais, Martini, & Onoue, 2010; Chablais, Martini, Samankassou, et al, 2010; Chablais, Onoue, & Martini, 2010; Chablais et al, 2011; Del Piero, Rigaud, Peybernes, et al, 2022; Fucelli et al, 2021; Heerwagen & Martini, 2020; Khalil et al, 2018; Martindale et al, 2015; Onoue et al, 2009; Peybernes et al, 2015; Peybernes, Chablais, Onoue, Escarguel, & Martini, 2016; Peybernes, Chablais, Onoue, & Martini, 2016; Peybernes et al, 2020; Peyrotty, Rigaud, et al, 2020; Peyrotty, Brigaud, & Martini, 2020; Peyrotty, Ueda, et al, 2020; Rigaud et al, 2010, 2012, 2016; Rigaud, Vachard, & Martini, 2015; Rigaud, Martini, & Rettori, 2013; Rigaud, Blau, et al, 2013; Rigaud, Martini, & Vachard, 2015; Rigaud & Martini, 2016; Sano et al, 2012; Senowbari‐Daryan et al, 2010; Zonneveld et al, 2007). The remnants of those systems occur today in the Circum‐Pacific area, either in accretionary complexes (i.e., Philippines, Japan, Russian Far East) or on accreted terranes (USA, Canada, Mexico) (Figure 1).…”

Section: Introductionmentioning

confidence: 94%

Sedimentology and biostratigraphy of the upper Triassic carbonates from the Shiriya cape, North Kitakami Belt, Japan

et al. 2022

Self Cite

Relics of the Panthalassa Ocean occur today in accretionary complexes and terranes on the entire Circum‐Pacific region. Among them, remains of shallow‐water carbonate systems provide valuable information about the ecology and environmental conditions that prevailed in this immense ocean. In this regard, the Shiriya Cape of the North Kitakami Belt (Aomori Prefecture, Honshu Island, Japan) is an essential place to study. Characterized by the presence of numerous limestone deposits embedded in typical accretionary mélange, including pluri‐kilometric massive slabs and metric bedded deposits, the cape is indeed a key vestige of carbonate deposition in the Panthalassa. All the limestone outcrop form the Shiriya Cape were sampled and studied in detail for the first time. Despite a general poor preservation, macroscopic sedimentary features such as burrows and large megalodontids patches as well as four microfacies were identified and are presented in detail in this work. On the basis of foraminifers and conodonts biostratigraphy, the age of the limestone deposits is defined as Norian. Similarities with analogous and synchronous systems from Panthalassan and Tethyan realms are extensively discussed. The closest analog to the Shiriya limestone appears to be the Panthalassan Dalnegorsk limestone (Russian Far East), both regarding microfacies and depositional setting. Sedimentary successions similar to Lofer‐cycles, well known in Tethyan synchronous systems, were also discovered in the Shiriya Cape. Along with the large limestone slabs, countless limestone‐bearing conglomerates also crop out on the Shiriya Cape. Their study and comparison with similar deposits in Japan highlighted their importance in the understanding of the dismantling of mid‐oceanic carbonates. The observations and comparison with well‐known carbonate systems permitted to establish a hypothetical depositional model of the Shiriya limestone corresponding to a Norian isolated carbonate system developed on an immerged volcanic seamount.

“…More difficult seems to be comparing the facies models proposed for the mixed carbonate-siliciclastic Upper Triassic Antimonio and Vizcaíno terranes of Mexico proposed in [44] and [43], respectively. The Upper Triassic strata in these two terranes are interpreted to have been deposited in a continentally influenced ramp setting where the moderate to high siliciclastic input might have played a fundamental role in influencing the carbonate sedimentation.…”

Section: Comparison With Other Upper Triassic Carbonate Systems Studi...mentioning

confidence: 99%

“…With the objective of closing this knowledge gap, the REEFCaDe (REEF and Carbonate Development) scientific project was launched at the University of Geneva fourteen years ago. Over this timeframe, various Upper Triassic Panthalassan localities were investigated in the Russian Far East [17,21], Japan [18,[22][23][24][25][26][27][28][29][30], the United States [30][31][32][33][34][35][36][37][38][39][40][41], Mexico [42][43][44] and Canada [45][46][47]. Several aspects of the taxonomy, paleoecology, stratigraphy and distribution of diverse organisms in Panthalassa, including foraminifera (e.g., [26,30,[35][36][37][38][39][40]46]), calcareous algae [48], ostracods [47], halobiid bivalves [41,45] and reef biota [22], have been clarified in the framework of this long-term effort.…”

Section: Introductionmentioning

confidence: 99%

Upper Triassic Carbonate Records: Insights from the Most Complete Panthalassan Platform (Lime Peak, Yukon, Canada)

et al. 2022

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Upper Triassic carbonate platforms from the Panthalassa Ocean remain less-understood and less-studied than their Tethyan equivalents. This imbalance is largely due to the poorer preservation state of Panthalassan carbonate rock successions in terms of rock quality and depositional geometries, which prevents good appreciation of depositional systems. In this context, carbonate exposures from Lime Peak (Yukon, Canada) represent an outstanding exception. There, the remains of an Upper Norian Panthalassan carbonate platform are well-exposed, show remarkably preserved depositional geometries and overall superior rock preservation. In this work, we analyse the carbonates from the Lime Peak area with particular attention to the vertical and lateral distribution of biotic assemblages and microfacies at the platform scale. Results demonstrate that the Lime Peak platform was surrounded by a basin with an aphotic sea bottom. The carbonate complex developed in warm waters characterized by high carbonate saturation. The area was also defined by moderate to high nutrient levels: this influenced the type of carbonate factory by favouring microbialites and sponges over corals. During its growth, Lime Peak was influenced by tectono-eustatism, which controlled the accommodation space at the platform top, primarily impacting the internal platform environments and the stability of the slope. Gaining better knowledge of the spatial distribution and dynamics of Upper Triassic organisms and sedimentary facies of Panthalassa in relation to tectono-eustatism lays the first foundations for reconstructing more robust platform models and understanding the evolution of other, more dismantled Upper Triassic Panthalassan carbonate systems through time.