{"id":21564,"date":"2020-02-24T09:25:06","date_gmt":"2020-02-24T08:25:06","guid":{"rendered":"http:\/\/karmaka.de\/?p=21564"},"modified":"2020-04-09T16:49:02","modified_gmt":"2020-04-09T15:49:02","slug":"zhob-18-96-kg-h3-4-s2-registered-as-witnessed-fall-in-zhob-district-baluchistan-pakistan-on-9-january-2020","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=21564","title":{"rendered":"Zhob (18.96 kg, H3-4, S2) registered as witnessed fall in Zhob District, Balochistan, Pakistan on 9 January 2020"},"content":{"rendered":"\n

LINK<\/strong><\/a><\/p>\n\n\n\n

“Zhob 31\u00b022\u2019N, 69\u00b034\u2019E<\/p>\n\n\n\n

Baluchistan, Pakistan<\/p>\n\n\n\n

Confirmed fall: 2020 Jan 9<\/p>\n\n\n\n

Classification: Ordinary chondrite (H3-4)<\/p>\n\n\n\n

History: (Michael Farmer, Arizona) A bright fireball followed by sonic booms was seen and heard around the northern part of the Baluchistan province of Pakistan, approximately 6:30 pm local time on 9 January 2020. Shortly thereafter, a stone fell through a house in a local village of the Mando Khel tribal area ~12 km NE of Zhob, Zhob District, Baluchistan province, Pakistan. The largest stone was found shortly after the fall by goat herders. Two more stones were subsequently found in this area.<\/p>\n\n\n\n

Physical characteristics: To date, four fusion-crusted stones have been found: 6.309, ~5.5, 4.924, and 2.231 kg. The stones are blocky to rounded, with broad shallow regmaglypts, and covered with black matte fusion crust. The 6.309 kg stone is broken, exposing ~15 \u00d7 9 cm of the interior, which displays a breccia of rounded to sub-rounded, light-colored clasts in a light-gray matrix. The clasts range from 1 cm to 5 \u00d7 4 cm. The stone is easy to break and weakly consolidated. The measured density of a 24 g fragment that contains both the lithologies is 3.18 g\/cm3.<\/p>\n\n\n\n

Petrography: (L. Garvie, ASU) The exposed surface of the 6.309 kg stone has an earthy luster, with scattered small (<1 mm) chondrules and rare troilite fragments to 4 mm. No shock veins are visible. Two polished mounts were examined from the gray matrix and a large light-colored clast, respectively. Gray matrix: Section dominated by chondrules and chondrule fragments set in a fine-grained fragmental matrix. Chondrules abundant and clearly visible under a petrographic microscope and BSE imaging, with an apparent mean diameter of 460 \u00b5m (n=36). Some PO and PP chondrules show phenocrysts with clear zoning. A PO and BO chondrule contains transparent purple glass. Fe-Ni metal dominated by two grain types: the first is irregularly shaped, with holly-leaf-shaped outlines, to 200 \u00b5m grains of kamacite that are single crystals exhibiting weakly developed Neumann bands; the second are rounded grains up to 150 \u00b5m, with thin taenite rims enclosing cores of dark-etching plessite. Native copper is rare occurring as grains to 20 \u00b5m between Fe-Ni metals and troilite. Troilite grains to 150 \u00b5m are largely single crystals and lack shock lamellae. Chromite is a common accessory mineral, occurring as anhedral grains to 200 \u00b5m and as fine-grained chondrule-like aggregates to 300 mm. Light-colored clast: The petrography and chondrule size in this clast is similar to the gray matrix section, but differs in showing a coarser grained matrix with abundant feldspathic phase up to 20 \u00b5m, and lacking chondrules with zoned olivine or pyroxene-bearing phenocrysts.<\/p>\n\n\n\n

Geochemistry: (A. Wittmann, L. Garvie, ASU) Gray matrix – Olivine (n=23) Fa17.2\u00b16.6, range Fa0.7-34.3, Cr2O3 to 1.2 wt% and CaO to 0.5 wt%. FeO\/MnO = 38.6\u00b17.9. Low-Ca pyroxene (n=20) Fs13.8\u00b15.3Wo1.3\u00b11.1, FeO\/MnO = 25.1\u00b110.3. High-Ca pyroxene (n=2) Fs1.1Ca45.9 and Fs24.2Ca30.5. Light-colored clast – Olivine (n=14) Fa18.5\u00b10.24, range Fa17.9-18.8, FeO\/MnO = 37.8. Low-Ca pyroxene (n=17) Fs15.3\u00b10.3Wo1.3\u00b10.1, FeO\/MnO = 23.4. Kamacite: Ni 6.71-7.08 wt%, Co 0.44-0.48 wt%. Feldspathic phase (stoichiometry is poor, FeO is fairly high): Ab81.4-83.1An10.7-12.6Or4.3-6.5 (n=10).”<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

The 6106-gram fragment of the broken 6309-gram mass of the Zhob meteorite in February 2020. Photo: Laurence Garvie<\/p>\n","protected":false},"excerpt":{"rendered":"

LINK “Zhob 31\u00b022\u2019N, 69\u00b034\u2019E Baluchistan, Pakistan Confirmed fall: 2020 Jan 9 Classification: Ordinary chondrite (H3-4) History: (Michael Farmer, Arizona) A bright fireball followed by sonic booms was seen and heard around the northern part of…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,7,47],"tags":[3251,1807,1832,5462],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21564"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=21564"}],"version-history":[{"count":5,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21564\/revisions"}],"predecessor-version":[{"id":21786,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21564\/revisions\/21786"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}