Relative contributions of crust and mantle to generation of Campanian high-K calc-alkaline I-type granitoids in a subduction setting, with special reference to the Harsit Pluton, Eastern Turkey

We present elemental and Sr-Nd-Pb isotopic data for the magmatic suite (similar to 79 Ma) of the Harsit pluton, from the Eastern Pontides (NE Turkey), with the aim of determining its magma source and geodynamic evolution. The pluton comprises granite, granodiorite, tonalite and minor diorite (SiO(2) = 59.43-76.95 wt%), with only minor gabbroic diorite mafic microgranular enclaves in composition (SiO(2) = 54.95-56.32 wt%), and exhibits low Mg# (<46). All samples show a high-K calc-alkaline differentiation trend and I-type features. The chondrite-normalized REE patterns are fractionated [(La/Yb)(n) = 2.40-12.44] and display weak Eu anomalies (Eu/Eu* = 0.30-0.76). The rocks are characterized by enrichment of LILE and depletion of HFSE. The Harsit host rocks have weak concave-upward REE patterns, suggesting that amphibole and garnet played a significant role in their generation during magma segregation. The host rocks and their enclaves are isotopically indistinguishable. Sr-Nd isotopic data for all of the samples display I(Sr) = 0.70676-0.70708, epsilon(Nd)(79 Ma) = -4.4 to -3.3, with T(DM) = 1.09-1.36 Ga. The lead isotopic ratios are ((206)Pb/(204)pb) = 18.79-18.87, ((207)Pb/(204)Pb) = 15.59-15.61 and ((208)Pb/(204)Pb) = 38.71-38.83. These geochemical data rule out pure crustal-derived magma genesis in a post-collision extensional stage and suggest mixed-origin magma generation in a subduction setting. The melting that generated these high-K granitoidic rocks may have resulted from the upper Cretaceous subduction of the Izmir-Ankara-Erzincan oceanic slab beneath the Eurasian block in the region. The back-arc extensional events would have caused melting of the enriched subcontinental lithospheric mantle and formed mafic magma. The underplating of the lower crust by mafic magmas would have played a significant role in the generation of high-K magma. Thus, a thermal anomaly induced by underplated basic magma into a hot crust would have caused partial melting in the lower part of the crust. In this scenario, the lithospheric mantle-derived basaltic melt first mixed with granitic magma of crustal origin at depth. Then, the melts, which subsequently underwent a fractional crystallization and crustal assimilation processes, could ascend to shallower crustal levels to generate a variety of rock types ranging from diorite to granite. Sr-Nd isotope modeling shows that the generation of these magmas involved similar to 65-75% of the lower crustal-derived melt and similar to 25-35% of subcontinental lithospheric mantle. Further, geochemical data and the Ar-Ar plateau age on hornblende, combined with regional studies, imply that the Harsit pluton formed in a subduction setting and that the back-arc extensional period started by least similar to 79 Ma in the Eastern Pontides.Geochemistry & GeophysicsMineralogySCI(E)33ARTICLE4467-48716

COVID-19 Pandemic and the Global Perspective of Turkish Thoracic Society

It has been more than 3 months now since the first case of COVID-19 was reported in Turkey. Globally, the number of confirmed cases and deaths reached 9,653,048 and 491,128 respectively, as reported by 216 countries by June 27, 2020. Turkey had 1,396 new cases, 194,511 total cases, and 5,065 deaths by the same date. From the first case until today, the Turkish Thoracic Society (TTS) has been very proactive in educating doctors, increasing public awareness, undertaking academic studies, and assisting with public health policies. In the present report, social, academic, and management perspectives of the pandemic are presented under appropriate subtitles. During this critical public health crisis, TTS has once again demonstrated its readiness and constructive stance by supporting public health, healthcare workers, and the environment. This review summarizes the perspective of TTS on each aspect of the COVID-19 pandemic and casts light on its contributions.C1 [Kokturk, Nurdan] Gazi Univ, Sch Med, Dept Pulm Med, Ankara, Turkey.[Itil, Bahriye Oya; Ergan, Begum; Kilinc, Oguz; Simsek, Gokcen Omeroglu; Ucan, Eyup Sabri] Dokuz Eylul Univ, Sch Med, Dept Pulm Med, Izmir, Turkey.[Altinisik, Goksel] Pamukkale Univ, Sch Med, Dept Pulm Med, Denizli, Turkey.[Adiguzel, Nalan; Karkurt, Zuhal] Univ Hlth Sci, Istanbul Sureyyapas Chest Dis Training & Res Hosp, Dept Intens Care Unit Pulm Med, Istanbul, Turkey.[Akgun, Metin] Ataturk Univ, Dept Pulm Med, Sch Med, Erzurum, Turkey.[Akyildiz, Levent] Mem Dicle Hosp, Clin Pulm Med, Diyarbakir, Turkey.[Altin, Sedat; Akyil, Fatma Tokgoz] Univ Hlth Sci, Yedikule Chest Dis & Chest Surg Training & Res Ho, Dept Pulm Med, Istanbul, Turkey.[Arikan, Huseyin] Yuzuncu Yil Univ, Dursun Odaba Med Ctr, Med Intens Care Unit, Van, Turkey.[Ates, Gungor] Sultan Hosp, Dept Pulm Med, Diyarbakir, Turkey.[Ay, Pinar] Marmara Univ, Sch Med, Dept Publ Hlth, Istanbul, Turkey.[Aykac, Nilufer] Gayrettepe Florence Nightingale Hosp, Clin Pulm Med, Istanbul, Turkey.[Babayigit, Cenk] Mustafa Kemal Univ, Sch Med, Dept Pulm Med, Antakya, Turkey.[Bostan, Pinar] Istanbul Bilgi Univ, Sch Hlth Sci, Istanbul, Turkey.[Cinel, Guzin] Ankara Yildirim Beyazit Univ, Sch Med Ankara, Dept Pediat Pulmonol, Ankara, Turkey.[Calisir, Haluk Celaleddin] Yapi Kredi Hlth & Retirement Fdn, Istanbul, Turkey.[Celik, Pinar; Gultekin, Okkes; Havlucu, Yavuz; Yorgancioglu, A. Arzu] Celal Bayar Univ, Sch Med, Dept Pulm Med, Manisa, Turkey.[Cetinkaya, Pelin Duru] Univ Hlth Sci, Adana City Training & Res Hosp, Dept Pulm Med, Adana, Turkey.[Dagli, Elif] Turkish Thorac Soc, Ankara, Turkey.[Demir, Ahmet Ugur] Hacettepe Univ, Sch Med, Dept Pulm Med, Ankara, Turkey.[Demir, Canan; Sandal, Abdulsamet] Occupat & Environm Dis Hosp, Clin Occupat Dis, Ankara, Turkey.[Dikensoy, Oner] Acibadem Univ, Sch Med, Dept Pulm Med, Istanbul, Turkey.[Edis, Ebru Cakir] Trakya Univ, Sch Med, Dept Pulm Med, Edirne, Turkey.[Elbek, Osman] Kadikoy Florence Nightingale Hosp, Clin Pulm Med, Istanbul, Turkey.[Erdinc, Munevver; Goksel, Tuncay; Gurgun, Alev; Basoglu, Ozen K.; Sayiner, Abdullah] Ege Univ, Sch Med, Dept Pulm Med, Izmir, Turkey.[Eyuboglu, A. Fusun Oner] Baskent Univ, Sch Med, Dept Pulm Med, Ankara, Turkey.[Gemicioglu, Bilun] Istanbul Univ Cerrahpasa, Cerrahpasa Sch Med, Dept Pulm Dis, Istanbul, Turkey.[Gulhan, Erkmen] Ataturk Chest Dis & Thorac Surg Training & Res Ho, Dept Thorac Surg, Ankara, Turkey.[Gurkan, Canan Gunduz; Yildiz, Tekin] Univ Hlth Sci, Sureyyapasa Chest Dis & Thorac Surg Training & Re, Dept Pulm Med, Istanbul, Turkey.[Karakurt, Sait] Marmara Univ, Sch Med, Dept Intens Care Unit Pulm Med, Istanbul, Turkey.[Kocabas, Ali] Cukurova Univ, Sch Med, Dept Pulm Med, Adana, Turkey.[Kul, Seval] Gaziantep Univ, Sch Med, Dept Biostat, Gaziantep, Turkey.[Nayci, Sibel] Mersin Univ, Sch Med, Dept Pulm Med, Mersin, Turkey.[Ozkan, Metin] Ankara Mem Hosp, Clin Pulm Med, Ankara, Turkey.[Pinarer, Ozgun] Galatasaray Univ, Sch Engn, Istanbul, Turkey.[Salturk, Cuneyt] Istanbul Yeni Yuzyil Univ, Sch Med, Dept Pulm Med, Istanbul, Turkey.[Sen, Elif] Ankara Univ, Sch Med, Dept Pulm Med, Ankara, Turkey.[Karadag, Bulent Taner] Marmara Univ, Sch Med, Dept Pediat Pulmonol, Istanbul, Turkey.[Toreyin, Zehra Nur] Hlth Sci Univ, Adana City Training & Res Hosp, Dept Occupat Dis, Ankara, Turkey.[Varol, Ayhan] Kepez State Hosp, Clin Pulm Med, Antalya, Turkey.[Yasin, Yesim] Acibadem Univ, Sch Med, Dept Publ Hlth, Istanbul, Turkey.[Bayram, Hasan] Koc Univ, Sch Med, Dept Pulm Med, Istanbul, Turkey

Respiratory functions in the follow-up of children with COVID-19 infection

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