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Puchezh-Katunki impact structure: No link with any extinction event revealed by 40Ar/39Ar

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by Ralph MT  Geological map of Puchezh-Katunki impact structure from Holm-Alwmark (2021). Isotope geochemistry provide a key in unraveling the absolute ages of rocks and even impact events in the past. The quest for worldwide search for evidence of impact events that can be temporally correlated to extinction events and major biotic crisis were prompted by the established notion supported by geochemical evidence of a large asteroid impact that ended the Cretaceous period around 66 million years ago and is associated with one of the massive extinction events that has occurred on Earth, also known as the K-T boundary. One example for this quest is the Puchezh-Katunki impact structure which is located in the central part of the East European platform, in the Privolzhsky Federal District of Russia. Its impact structure is well-preserved with an 8–10 km-in diameter central uplift surrounded by an annular depression that is about 40 km in diameter and is presently buried under a ...
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Intraplate volcanism in a convergent zone?: Origin and Tempo delineated by REE and 40Ar/39Ar

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Veneto Volcanic Province by Ralph MT Different tectonic settings have its own geochemical signatures that tells a tell-tale sign on the processes that occurred in the geological past. High temperature geochemistry which involves geochemical affinity and geochronology provides a window to these processes. One such example is the Veneto Volcanic Province, which is a Cenozoic intraplate volcanic province located in the Southeastern Alps, Northwest of Italy. The Veneto volcanic province is closely associated with the formation of the Alpine Belts that was formed out from the convergence of the European plate and Adria microplate that initiated about a 100 million years ago.  Geochemical signatures of the subduction event between the European plate and Adriatic microplate have been noted from the presence of calcalkaline to shoshonitic affinities of intrusive bodies and basaltic and andesitic dikes. Calc-alkaline volcanism is expected to be constrained in the tectonic setting of converg...
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GeoFeature | AA Lava in La Palma island

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Reposted from the A-Team PandaCubs by Ralph Tenido La Palma volcanic island which is part of the Canary Islands have been all around the news since it became volcanically active since the 19th of September 2021. Videos and photos of the Cumbre Vieja volcano erupting basaltic lava flows have been circulating showing as how it engulfed houses, buildings and anything on it's path. In this #GeoFeature, we will be highlighting one of the basaltic lava flows observed during the La Palma eruption, which is the basaltic AA lava flow. In the photo at the center, a geologist is taking a sample from the aa lava flow in La Palma, taken on October 31, 2021. Aa lava is more viscous relative to it's counterpart, the pahoehoe lava. Due to this, it tends to produce a thicker and slower flow with blocky, rough, and angular exterior. Autobrecciation is the process where the aa lava continuously breaks itself apart as it flows producing blocks called clinkers or scoria. Clinkers were derived from ...
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A Short Geological Discussion on The Proposed Dumaguete 174 Reclamation Project: Spatial and Temporal Implications

by Ralph MT "Civilization exists by geological consent, subject to change without notice”  ~  Will Durant Through a Private Sector Partnership, the local government of Dumaguete City is in view to enter into a Memorandum of Understanding with E.M Cuerpo, Inc., a construction company based on Quezon City, for the proposed “Smart City”. The projected “Smart City” is a 174-hectares artificial, off-shore island, situated 30 meters from the mainland, which would stretch the entire coast of Dumaguete City. The project is said to amalgamate 5G ready connections, coastal waste water treatment facility, shoreline slope and water protection esplanades, modern ferry boat, marina and open area for sports facility, residential, condominiums, malls and other business hubs. With a grandeur project such as this, sustainability, geological factors, and mitigation of geohazards is of utmost significant that needs to be considered and evaluated to check the feasibility of the project. This paper...
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Looking back 2 years ago of our Siquijor Fieldwork during the pandemic

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It's been 2 years since we had our first fieldwork at the Siquijor Island, Central Visayas, Philippines, on our Geol 201 - Petrology class. We didn't expect that would be our last as well because of the pandemic that began in March 2020 and classes were put into an online setting. As one door closes, another opens. Given in the situation that we are stuck at home, it's better to at least capitalize the available resources at home to at least learn something new and is practical in our field. Learning QGis. Last time, we were instructed to submit a technical output on our fieldwork in Siquijor Island. Though I was able to submit it on time, I know there are still things lacking in my paper. ( A/N: I'll be sharing my interpretations and the output of my paper of our fieldwork in the next blog) Incorporating maps in a report is a must need especially for a student studying Geology, and now I have finally the resources ( laptop hehe I just got one huhu finally) I'm gi...
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