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China imposes anti-dumping tariffs of up to 54.3 % on US, Mexican pecans in form of deposits: MOFCOM_我的网站

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一 |     法兰克福歌德大学地球科学研究所的Frank Brenker 教授解释说:“这些矿物的转变极大地阻碍了地幔中岩石的运动。    

Ministry of Commerce
    Ministry of Commerce
China on Monday decided to impose anti-dumping tariffs of up to 54.3 percent on imports of pecans (Carya illinoensis) from Mexico and the US in the form of deposits after it ruled preliminarily that imports of pecans from the two countries were dumped in the Chinese market, China's Ministry of Commerce (MOFCOM) announced.  
The investigating authority found a causal link between the alleged dumping of imports of pecans from Mexico and the US and the injury suffered by Chinese producers. The ministry said it will impose provisional anti-dumping measures in the form of security deposits beginning August 11, 2026, according to an announcement on the ministry's website on Monday.
The dumping margins for Mexican companies were determined to be 17.8 percent to 51.6 percent. Since no US company has responded to the investigation, and in accordance with Chinese law and WTO rules, the dumping margin for all US companies was determined on the basis of the best information available at 54.3 percent, according to a spokesperson of the MOFCOM. 
China launched the anti-dumping investigation into pecan imports from Mexico and the US on September 25, 2025, under its Anti-Dumping Regulations, according to the ministry.
A number of Mexican companies responded to the investigation, but no US companies did so. 
China has always exercised caution and restraint in using trade remedy measures, and remains firmly committed to safeguarding fair and free trade, the MOFCOM spokesperson said on Monday, briefing on the preliminary ruling. China will continue to conduct the investigation in accordance with the law, fully protect the rights of all interested parties, and make an objective and impartial final ruling based on the findings of the investigation, the spokesperson said.
Pecans, also known as American walnuts or thin-shelled walnuts, are used both as snacks and in baking, and can also be processed into edible oil.
The MOFCOM spokesperson said that the ministry has conducted the investigation in accordance with the principles of fairness, impartiality, openness, and transparency, and in strict compliance with relevant Chinese laws and regulations as well as WTO rules.
The ministry said interested parties may submit written comments within 10 days of the announcement.
Global Times
。例如,地幔羽流--从深层地幔上升的热岩柱--有时会直接停在过渡带下面。相反方向的质量运动也会停顿下来。俯冲板块往往难以突破整个过渡区。

二 | 因此,在欧洲下面的这个区域,有一整个这样的板块的‘墓地’。

三 | ”然而,直到现在,人们还不知道“吸入”过渡带的物质对其地球化学成分的长期影响是什么,以及那里是否存在更大量的水。

四 | Brenker解释说。

五 | “俯冲板块还将深海沉积物捎带着带入地球的内部。

六 | 这些沉积物可以容纳大量的水和二氧化碳。但是直到现在还不清楚到底有多少以更稳定的水合物矿物和碳酸盐的形式进入过渡带--因此也不清楚大量的水是否真的储存在那里。”目前的情况无疑会有利于此。

七 | 厚重的矿物瓦茨利石和林伍德石可以容纳大量的水(与较低深度的橄榄石不同),以至于假设过渡带可以吸收我们海洋中六倍的水量。“所以我们知道边界层有巨大的储水能力,”Brenker说。“然而,我们不知道它是否真的这样做了。”现在,一项国际研究已经提供了答案。该研究小组分析了来自非洲博茨瓦纳的一颗钻石。它起源于660公里的深度,直接位于过渡带和下地幔之间的界面,那里的主要矿物是林伍德石。来自这一地点的钻石非常罕见,甚至在极其罕见的超深产地的钻石中也是如此,这些钻石只占所有钻石的1%。研究发现,由于存在许多林伍德石内含物,该宝石的含水量很高。

八 | 研究小组还能够确定该石头的化学成分。它几乎与世界上任何地方的玄武岩中发现的几乎所有地幔岩石碎片的化学成分完全相同。这表明该钻石肯定来自于地球地幔的一个正常片段。“在这项研究中,我们证明了过渡区不是一块干燥的海绵,而是拥有相当数量的水,”Brenker说,并补充道。“这也使我们离Jules Verne关于地球内部的海洋的想法又近了一步。

九 | ” 不同的是,那里没有海洋,而是水合岩石,根据Brenker的说法,水合岩石既不会感到潮湿,也不会滴水。早在2014年科学家们就在过渡带的一颗钻石中首次检测到了水合林伍德石。Brenker也参与了这项研究。然而,由于该钻石太小,不可能确定它的精确化学成分。因此,仍然不清楚第一项研究对整个地幔的代表性,因为那颗钻石的水含量也可能是由一个奇特的化学环境造成的。相比之下,研究小组在本研究中调查的来自博茨瓦纳的1.5厘米(0.6英寸)的钻石中的包裹体足够大,可以确定精确的化学成分,这为2014年的初步结果提供了最终确认。过渡带的高水含量对地球内部的动态情况有着深远的影响。这导致了什么,例如,在来自下面的热地幔羽流中可以看到,这些羽流被困在过渡带。在那里,它们加热了富含水分的过渡带,这反过来又导致了新的较小的地幔羽流的形成,吸收了储存在过渡带的水分。如果这些较小的富水地幔羽流现在进一步向上迁移并突破边界进入上地幔,就会发生以下情况。地幔羽流中所包含的水被释放出来,这降低了新出现的物质的熔点。因此,它立即熔化,而不是像通常发生的那样,在到达地表之前就熔化。因此,地球地幔这一部分的岩石块总体上不再那么坚硬,这使质量运动更有活力。过渡带本来是那里的动态的障碍,突然变成了全球物质循环的驱动器。

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